Sheldon Cooper

Sheldon Lee Cooper is one of the main characters from the Big Bang Theory series.

Sheldon is a Caltech theoretical physicist who formerly shared an apartment with his colleague and best friend, Leonard Hofstadter. Along with Leonard, he is the main male protagonist. Originally from East Texas, Sheldon started college at the age of 11, receiving his first Ph.D. at the age of 16. Sheldon was involved in numerous experiments as a "wunderkind", such as his plan to provide free electricity for his hometown by building a nuclear reactor - a plan stopped by government pen pushers claiming it's illegal to store yellowcake uranium in a garden shed. Proudly geeky, he has no qualms about speaking Klingon, wearing vintage t-shirts sporting superhero logos, or spouting various historical and cultural anecdotes (e.g., his account of the introduction of the fork into Thailand). While he might claim to be the perfect human specimen, Sheldon does have his faults. Sheldon is characterized by a strict adherence to routine and hygiene; an overly intellectual personality; a tenuous understanding of irony, sarcasm and humor; and a general lack of humility or empathy, the former of which is demonstrated in the fact that he has no problem voicing to his peers his admiration for his superior intellect. These qualities, along with his penchant for pranks, are his character's main source of humor. He is often considered to be the most iconic character of the show. Sheldon has developed a more human personality due to the influences of his friend Penny and his wife Amy, but some of it does not always show up.

Appearance
Sheldon is a tall, lean, yet well-built man, originally in his late twenties, but he's in his late thirties by now. He is 6' 1" (1.85 m) with brown hair and blue eyes. His wardrobe consists of vintage T-shirts (which he always wears over a long-sleeve) adorned with references to superheroes, quantum physics, Sci-Fi television shows, and robots. Sheldon often expresses his mood through his choice of attire; especially his t-shirts. He's got a collection SO large in fact, that it has its own page on the Wiki under Sheldon's Wardrobe. He also owns a dark blue plaid suit which he wears for lecturing and other formal occasions.

He also appears to enjoy Reddit, as he has been seen with a Reddit alien shirt. He usually wears a long sleeve shirt underneath it along with plaid pants. Sheldon is tall and thin (setting him apart from his shorter colleagues), with Penny, and later Leonard, saying he looks like a giant praying mantis.

In Season 1 of Young Sheldon, Sheldon is a rather tall, skinny, adorable 9 year old kid (10 later on). He is about 4' 5" (1.35 m) and his hair is slightly brighter than in The Big Bang Theory. In fact, in The Big Bang Theory, while he is an adult, his fashion is more kid-like, however, in Young Sheldon, while he is a kid, his fashion is more adult-like.

Personality
Aside from his characteristic idiosyncrasies, Obsessive–compulsive disorder, obsessions, and extreme narcissism, Sheldon does not understand why humans are illogical and tries to be logical himself.(Though he is actually more illogical than most people in so many ways Ex: Fear of change, fear of birds, expecting others to change for him, throwing childish tantrums, being immature, etc.) He possesses an eidetic memory and an IQ of 187, although he claims his IQ cannot be accurately measured by normal tests. Sheldon has an overly extensive general knowledge, such as shown by his comments regarding various details of anecdotal knowledge (for instance, about the introduction of the fork into Thailand). It was also revealed in "The Sales Call Sublimation" that Sheldon, possibly, has synesthesia. He told Raj that he automatically sees prime numbers as red and that twin primes appear pink and smell like gasoline. These are characteristics of people with synesthesia.

Sheldon also has qualities associated with being a prodigy, such as an inflated ego, social ineptitude, and an inability to relate emotionally with other people. Despite his intelligence, he has a distinct lack of emotional maturity and is often baffled by even the most common social interactions. He not only fails to understand the simplest sarcastic jokes made by his friends, but also regards their sadness over problems with blatant confusion.

Recently, he has begun to understand the concept of sarcasm, attempting unsuccessfully to employ it himself towards Penny in the second season, and successfully employing it towards his other friends in the third season. He appears to have a complete disinterest in romantic relationships, and his eccentricities, direct remarks, and demanding nature put him at odds with his own friends and especially Penny.

Up until "The Empathy Optimization", Sheldon never seemed to have any sense of remorse or guilt. Perfect examples of this includes when he ratted out Leonard, Raj, and Howard for sexual behavior to Human Resources just because he thought he did nothing wrong, and when he puts down Amy by not treating her accomplishments like they were a big deal.

Sheldon is extremely arrogant, narcissistic, selfish and utterly self-righteous. According to Sheldon's Meemaw, it's strongly implied that Sheldon takes after his grandfather, Pop-pop, who was known for being "a stubborn, egotistical man". When the group find an actual prop of the One Ring from Lord of the Rings Sheldon immediately snatches it off Howard, bluntly declaring ' Mine! ' and, when people protest to this, he moans 'I don't understand why, in this group, I never get my way! ', completely oblivious to the fact that he always gets his way - through coercion, bullying or genuinely interfering with or ruining other people's lives until he gets his way. When he does not get the Ring, he constantly tries to retrieve it, to the point of invading his own friends' privacy and boundaries and effectively stealing it off them (He tried to steal it off Penny whilst she was sleeping, only resulting in her hyperactively punching him and breaking his nose, and later pickpocketing Leonard whilst he was relieving himself in the men's room). This particular example shows that his great love for fictional movie or comic materials or rights make him extremely obsessed with things that don't really matter in the real world. Sheldon will try and achieve, retrieve or maintain anything if it meant that he would seem (Fictionally or genuinely) superior to everybody else.

Sheldon adheres to the roommate agreement constantly when things do not go his way and, interestingly, Sheldon has styled the roommate agreement so that everything goes his way. Also, Sheldon officiates in said agreement that he settles all ties, increasing the likelihood that he gets what he wants. That being said, when a clause of the Roommate Agreement applies to him to not do something, he will treat it like it is ridiculous - in the process, hypocritically violating the Agreement despite constantly chiding Leonard when he apparently violates it. He also, at one point, when Leonard headed a project for the group, Sheldon labelled him as simply the founder, whilst he was chief or head of absolutely everything else, making him in charge. He also tried to make the project named after himself, even trying to get by naming the project with his name spelt backwards. Sheldon is revealed by Priya to have repeatedly violated the roommate agreement, and the several demonstrations of this cause deep discomfort and even despair in Sheldon, who becomes vengeful and deliberately damages Leonard and Priya's relationship through blackmail afterwards.

Sheldon does not see fault in absolutely anything he does in his life, to such an extent that he doesn't think that, when he commits a serious crime, he is doing anything wrong. He, at one point, insulted a judge whilst in court, simply because of his belief that his job and status was superior to the judge's, which landed him in prison in the first place. Sheldon also stalked President Siebert just to get a simple answer out of him, to the point of following him to his home and then calling him anonymously. Sheldon is willing to steal to get what he wants, and bully anybody to do so as well. A prime example is when he deliberately puts all of Penny's clothes on a telephone wire without acknowledging, or even probably noticing, that this was outright bullying of somebody without any moral reasons other than self-righteousness and phenomenal delusions of authority on his part.

He sees it as his absolute right to interfere with something that does not involve him, and alter it so that it benefits or pleases him, shown at one point when he interfered with Leonard's dating another woman despite it not concerning him at all. Another example is when Penny, after an argument with Leonard which upsets Sheldon, says that "this really isn't about you" his only (strained) response - after a very long pause - is "I don't follow", showing that he doesn't understand why he cannot be priority one in situations that don't even involve him. Sheldon also does not realize at all that he is an immense burden to everyone around him due to his controlling, condescending and demoralizing behavior - he rather sees himself as a true privilege to his friends simply out of egomania.

Sheldon is openly pompous and condescending towards people like Howard, treating him like a simpleton - to say the least - constantly. His incredible pomposity and self-delusion is so widespread that he immediately places himself in a position of absolute power, credit, benefit or authority in whatever project, ambition or situation which is discussed within earshot of him. He will also meet every single opposition to his authority with immense melodrama - he describes Leonard's control of one notable project as 'Leonard's reign of tyranny', despite being a dictator himself. He is also completely taken off guard when he is excluded from the project, because he is absolutely incapable of seeing anything he has done as a bad thing.

Sheldon is pompous and incredibly entitled, conceitedly picturing himself as either/or a mentor, teacher, father-figure, sensei, commander, superior and director simply out of intense self-delusion. He does not do an approximately miniscule amount of personal labor if he could avoid it, shown by how he is seen with Howard and Raj both carrying huge workloads of Christmas presents, whilst he is only carrying a small cylindrical present in one hand and eating an ice cream with the other. He appears completely indifferent, if not apathetic to the fact that they are on the edge of collapsing from exhaustion and could be crushed under the weight. Another supreme example is when he realizes that Amy is going to work at the same university as he is, and he simply goes over to her house and says 'You can't work where I work ', thinking that he has complete jurisdiction over where she works.

Another key example of Sheldon's selfishness is when he is ill. Sheldon demands that everyone else take care of him, even if they are occupied with other tasks or could be hurt or ill themselves due to never having been ill alone before. He also believes that being ill entitles him to be rude to others as shown during The Empathy Optimization, Sheldon was completely ungrateful and insulting to his friends and did not realize this until Leonard made him remember.

Although it is not confirmed, Sheldon appears to have extreme megalomaniacal tendencies - when he was a child, the kind of pet he wanted would be one that was capable of killing at telepathic command. He also, at several points in his childhood, tried to build devices and technologies that would enable him to kill or avenge himself on people who had done him wrong. At several points in his life, he fantasizes about "rising to power"Fkar, gaining a planet he can rule with an iron fist, even declaring that he will, one day, have a robot army at his disposal. In addition to this, Sheldon constantly brags that he will, one day, gain a Nobel Prize and suggests to several people that their contributions to his life will earn them a mention in his memoirs (A mention reading "You're welcome, mankind"). He also sees himself as a world-renowned physicist with an unparalleled understanding of the universe and that he is on the precipice of advancing mankind's understanding of the universe, ignoring the fact that there are some aspects of even science that he has some lack of understanding of, and he is notoriously able to make scientific mistakes - he was rendered absolutely speechless by an equation in a physics bowl which he didn't know the answer to, and was so angry that he couldn't figure it out that he denied the correct answer when it is provided. What this means generally is that he believes that mankind owes him big time, and has done so his entire life.

Sheldon's opinion of other people's professions, and his own (Professions in general, actually) is heavily ego-oriented, in that he sees any job that he has personally taken as superior to others. He has an extremely low opinion of Howard's profession as an engineer (He constantly scorns Howard's intellect based on him not having a PhD and the fact that he is an engineer), believes that geology is "the Kardashians of science" and also sees biology as a low point on the scientific ladder simply on the basis that it is, in his own words, "all about yucky, squishy things". However, despite scorning engineering as unimportant, he is shown to be somewhat extremely knowledgeable in the subject himself in terms of general knowledge (Certainly not field work), and therefore only condescends the subject because he finds the information and premise inferior to that of physics. Sheldon has remarked that it is his dream to be an astronaut, and that he was secretly stunned at Howard being chosen to go into space, stating in his own words that it showed him "they'd just send 'anyone' up there".

Sheldon's expression of his more advanced intelligence has gotten him fired from his job, and even Leonard is surprised to learn that Sheldon is conceited enough to believe that Isaac Newton is intellectually inferior to himself. Sheldon hates it when someone stops him when he is trying to explain something. If he is, a violent tic starts on his face until he can complete what he wants to say, as in The Friendship Algorithm when he is prevented from explaining why tapioca pudding is a jiggling bowl of potential death. He cannot and will not drive, and thus someone must always drive him unless in an extreme circumstance (like when he drives Penny to the emergency room in "The Adhesive Duck Deficiency".)

He also shows symptoms of obsessive compulsive personality disorder and Asperger syndrome, e.g., when he finds Penny's apartment messy, he sneaks in during the night and cleans it up because he can't stand being in the same hallway with something so disastrous. He refuses to sit anywhere other than his designated spot on the couch and follow set routines, and the running gag of the show is that when he knocks on Penny's door, he has to say Penny's name every three knocks (he does this thrice every time). The series creators do not want to specifically identify Sheldon's specific psychological malady.

Sheldon occasionally uses slang (in a very unnatural fashion), and follows jokes with his catchphrase "Bazinga!" He is not entirely sure how to hug someone, and he avoids human contact whenever possible. Despite his ego-centrism, Sheldon appears to be somewhat aware of his social ineptitude, particularly his lack of understanding of sarcasm. He mentioned that he keeps a record of his daily conversations after Penny snapped at him and Leonard asked him why, to which he suggested that Leonard check his conversation records "to see if I messed up anywhere." Sheldon is also a difficult person to work with and generally displays apathy to the world around him. In "The Toast Derivation", Sheldon was revealed to have criticized Bill Gates for focusing on his charity work rather than Windows Vista, a remark that earned him a punch in the face.

Sheldon also possesses some understanding of other religions such as Hinduism and corrects Rajesh when he says cows are gods, when they are actually like gods and was also knowledgeable about other Hindu beliefs however despite being raised in an extremely religious household, Sheldon possesses no faith in Christianity and even after moving back to Texas and planned to teach the religious types evolution and only moving back when his mother calls evolution opinion. Sheldon dons karma as "nonsense" and was left baffled when Rajesh compared it to Newtonian. Sheldon is extremely germaphobic and is very extreme in his methods to avoid catching an illness such as sterilizing his mouth with whiskey after sipping from Leonard's glass. Sheldon does his best to avoid any human contact however as the series continues he became more, if not a very slightly affectionate person such as hugging Leonard after he returned from Professor Proton's funeral and kissing Amy on board a locomotive.

Sheldon does show on rare occasion interest in relationships, which was most prominently seen with Amy Farrah Fowler; however, he does not express it directly, instead developing strange behavior patterns such as buying cats or refusing to open discussion to the matter. Despite this however Sheldon remains completely clueless to sexual innuendos which was present during his and Amy's anniversary and she became intoxicated which causes her to unbutton her blouse and asks that they skip to dessert for Sheldon to reply "I just had clobber." This was also evident when their upstairs neighbor "hooked up" with the producer of CSI and while the two are having intercourse he mistakes it for her jumping up and down on the bed; however, there one situation where he may have understood an innuendo. When Rajesh, Leonard, Wolowitz and Sheldon were competing over The One Ring and Penny appears with "a bag from Victoria's Secret", Sheldon and the rest all look at Leonard, he either understood what Penny meant or was looking because everyone else was.

Trivia

 * Sheldon has appeared in every episode including both pilots.
 * In "The Russian Rocket Reaction", Sheldon reveals he was 9 years old when he started his all-time enemies list on a 1989 floppy disk. His age is further constrained by the following consideration: Sheldon is a Taurus, according to "The Peanut Reaction", placing his birth date between April 19th and May 20th of 1980. This age is supported by Leonard's comment that Sheldon has been emotionally stuck for about 29 years in "The Einstein Approximation", with an air date of February 2010. However, a family chart in "The Cruciferous Vegetable Amplification" shows that he is 29 at the time of the episode, which aired in September 2010. Further, in "The Friendship Contraction", premiering in February 2012, Leonard described Sheldon as a "30-year-old man who can't survive on his own". (Though, it is possible Leonard was just being imprecise.) These latter two statements indicate a birth date between April 20th and May 21st of 1981 in the span of the Taurus. [Note that inconsistencies arise only if one assumes a temporal correspondence between the airdate of the referenced episode and the events featured in that episode. Therefore, Sheldon should be considered to have been born between April 19th – May 20th, 1980.]
 * Sheldon is 6 ft 1 in (1.85 m) tall – the height of Jim Parsons. (Parsons claims to measure 6 ft 2 in (1.88 m), presumably with shoes, and the Sheldon life-size standup poster is 74 inches in height.)
 * He weighs either 165 lbs (75 kg), as revealed in "The Porkchop Indeterminacy", or 140 lbs (63.5 kg), as estimated in "The Luminous Fish Effect". However, those are most likely inaccurate now, due to the amount of time that's passed.
 * He has been described as a "tall, thin... praying mantis" by both Penny and Amy Farrah Fowler.
 * According to his mother, Mary Cooper, Sheldon has her eyes, his daddy's temper, and "all that science stuff" comes from Jesus.
 * Several ways to annoy Sheldon are laid out in "The Bad Fish Paradigm" (S02E01), including:
 * Change the brightness/contrast settings of the television.
 * Take a Band-aid off in front of him.
 * Buy generic ketchup.
 * Forget to rinse the sink.
 * Talk to him through the bathroom door.
 * Adjust the thermostat.
 * Cook with cilantro leaves
 * Pronounce the 't' in 'often'
 * Make fun of trains
 * According to Sheldon, he says that his mom wants grandchildren through him, but Penny adds that she wouldn't want a test tube grandson born out of wedlock (this being against Mrs. Cooper's born-again religious beliefs).
 * Mary's water broke for Sheldon and Missy in a Kmart.
 * Sheldon kept track of his bowel movements in a notebook ever since he was 2, even down to color, shape and consistency. His first entry was "This is so embarrassing. What was wrong with diapers?"
 * Sheldon is rarely interested in sports, but is highly skilled at bowling and can consistently get strikes. ("The Wheaton Recurrence")
 * Sheldon was raised in a Christian household in Galveston, East Texas, Texas, USA (Texas just happens to be the same state that Jim Parsons was actually born in), although he once said his mom had to help his dad during tornado season, as the aluminum house he had slipped off its cinder blocks. (This could have been his father's way of a tornado shelter or his parents divorced by then and he moved into an aluminum trailer. The reason for these explanations being as we saw Sheldon's childhood home in the season 3 premier, where his mother still lives.)
 * Sheldon has perfected "glow-in-the-dark fish"
 * Sheldon has 212 friends on MySpace. Even though he hasn't met one of them, he thinks it's the beauty of it.
 * Sheldon is allergic to bees and cats and gets asthma when he is around them (despite having a pet cat as a child and a whole glaring of cats when he missed Amy.)
 * Sheldon considers himself to be the first "Homo novus" - a new, evolved species of Homo Sapiens.
 * Sheldon doesn't believe in luck or coincidence, instead citing the Law of Large Numbers (LLN) in statistics as the explanation for such phenomena.
 * Sheldon hates going to the local Renaissance fair because he doesn't like the historical inaccuracies, such as Bavarian purity laws, mead flagons made of polypropylene, "ye olde" being put in front of everything, even modern underwear.
 * Sheldon was humiliated on national radio during NPR's Science Friday with Ira Flatow when his voice became extremely high pitched due to Helium seeping into his office as part of a prank by Barry Kripke.
 * Sheldon agrees with the theory that 75-80% of any Rock-Paper-Scissors games you play with a person you are familiar with end up in a tie due to the limited number of outcomes, and accordingly he prefers the variation Rock-Paper-Scissors-Lizard-Spock.
 * Sheldon used a Doppler Effect costume for Halloween.
 * Sheldon uses his Green Lantern action figure as a safe place for his emergency money.
 * Sheldon is fluent in Morse code.
 * Sheldon believes that chocolate is the best flavor of pudding, trumping tapioca because of its high concentration of cyanide.
 * Sheldon's favorite amino acid is Lysine, which is a major plot point to control the dinosaurs in the novel/movie Jurassic Park
 * Sheldon thinks that his very strong attention to hygiene and his skill in writing Java Applets are the main reasons why his friends like him.
 * Sheldon loves trains and monkeys.
 * Sheldon fears dogs, dinosaurs, chickens and formerly, birds.
 * Sheldon had a cat named Lucky when he was a child, and this cat died because it was hit by a car. According to Leonard, this is another example of Sheldon's inability to understand irony.
 * Sheldon thought about creating a griffin after Lucky was killed, but his parents didn't want to secure the appropriate eagle eggs and lion semen.
 * Sheldon learned how to swim (on the floor) online.
 * Sheldon cannot stand whistling. ("The Friendship Algorithm")
 * Sheldon was very busy in his teenage years examining the range of diffusion in the super-symmetric theories, which brought him to re-examine the ultraviolet properties of supergravity a loop.
 * Sheldon's expenses account for 46.9% of his after-tax income.
 * According to Leonard, Sheldon doesn't like furniture made of reclaimed wood, because he believes the original owners will come back to take it.
 * Sheldon imposes and teaches behavior lessons to any friend of his who disappoints him for three consecutive times.
 * Sheldon thrives off his work, and if left jobless he loses all focus and moves onto a new experiment/obsession every day, much to Leonard's dismay.
 * Sheldon does not like teddy bears because he thinks bears are terrifying. He later told Amy that he does have one, and that he often used it to wipe his nose.
 * Sheldon was called by Leonard "one lab accident away from becoming a super villain".
 * According to Leonard, Sheldon loves having his brain scanned.
 * Sheldon only shows genuine affection for one person, his grandmother (or Meemaw), whom he writes to.
 * Sheldon is a Taurus, placing his birthday between April 21 and May 20, however, his birthday is apparently February 26th, which makes him a Pisces, causing a continuity error. Though, it's possible that Pennyguessed he was a Taurus.
 * Sheldon, though unwilling to fight, is physically the strongest of the group, easily holding his own against Raj in an arm wrestle, and once referred to Leonard and Howard as 'tiny tiny men'. He was also able to move his entire dresser, with reasonable ease when barricading his door, due to paranoia, after being burgled.
 * Sheldon owns a pocket watch. He bought it for himself when he was shopping for Amy to get her back in "The Shiny Trinket Maneuver". It is seen again in "The Locomotive Manipulation".
 * Sheldon's little toes and lateral incisors are degenerated, which he says is due to his high level of evolution which keeps him from using a motor vehicle correctly.
 * Sheldon once took a bet with Howard about a species of cricket, but lost and had to give Howard his Flashcomic book.
 * Sheldon went to a sci-fi convention on a bus for 10 hours and violated his personal rule of not urinating on buses twice to see Wil Wheaton, who didn't show up at the convention, which was revealed in season 5 that it was because Wheaton thought it be cooler to play on "Hollywood Squares". This and the events of the card tournament and bowling alley, led Sheldon to consider Wheaton his arch nemesis. He has made three websites dedicated to hating him: Willwheatonstinks.net, org and .com. It is unknown if Sheldon still has these websites after making up with Wil Wheaton.
 * Sheldon has actually been kind to Penny; in two episodes he actually drove her to the hospital because she dislocated her shoulder after she slipped and fell in the shower, and loaned her a significant amount of money to help her in a financial pinch. The latter favor led Penny to think everyone was grilling her on her financial situation, even when they weren't.
 * Sheldon was once offered a position at a secret military base, but was later forced to deny the position due to his inability to keep secrets.
 * Sheldon thought that the trip he and his friends took to the North Pole in Season 2/3 was "a hoot and a half."
 * It was mentioned that Sheldon and Leonard once had (before they were robbed) "A TV, 2 laptops, 4 external hard drives, a PS2, PS3, Xbox, Xbox 360, a classic Nintendo, a Super Nintendo, a Nintendo 64, a Nintendo Wii, Halo 1-3, Call of Duty 1-3, Rock Band 1-2, Final Fantasy 1-9, Legend of Zelda, Legend of Zelda: Ocarina of Time, Legend of Zelda: Twilight Princess, Super Mario Bros., Super Mario Galaxy, Mario and Sonic at the Winter Olympics, and Ms. Pac-Man. They also own Grand Theft Auto and Red Dead Redemption by Rockstar Games. They then probably got all the games and consoles again with a new T.V. and new computers. Sheldon's data was safe as well, as he was performing a backup in the previous episode. His new computer came with Windows 7 which he doesn't like because it's much more user friendly than Windows Vista.
 * Sheldon has adhesive whimsical duck stickers, holding umbrellas in his bathtub to prevent slipping.
 * Sheldon keeps a daily log of social interactions called Sheldon's Log (in reference of Captain's Log).
 * Sheldon doesn't trust banks because he believes that ATM machines will lead the charge of the robot armies when they revolt against humans.
 * Sheldon keeps Band-Aids with him at all times, as well as in his kitchen, top desk drawer, etc.
 * As of "The Excelsior Acquisition" (S3E16), Sheldon has a restraining order from Stan Lee as well as the late Leonard Nimoy. In "The Vacation Solution" (S5E16), he also mentions having one from the late Carl Sagan. In "The Proton Displacement" (S7E07), he gets a new one from Bill Nye the Science Guy.
 * Due to Sagan and Nimoy being deceased, it's possible that these restraining orders are null and void, unless they are also in effect for their final resting places.
 * Sheldon doesn't seem to understand the concept of racism. This is implied in "The Egg Salad Equivalency" when he calls Mrs. Davis a slave to her sexual desires, even though she is black. In "The Tenure Turbulence", he also gives her the HBO series Roots, which is about the slave trade in America.
 * Sheldon has an in depth knowledge of American Football, only because he was raised in Texas and his father would force him to watch it from the time he was four until he went off to college — the longest seven years of Sheldon's life.
 * Sheldon rarely laughs, but when he does, it is a quick internal breath while showing a small smile. One of the rare times we hear him laugh properly is in season 5's "The Vacation Solution" over a physics Mad Lib. Another time, he has laughed like that is when Leonard made a multiplication error that was published.
 * Sheldon has never worn a shirt with words, unless a shirt logo has words on it, like in episode 5 of season 4, and always wears a long sleeved shirt under a t-shirt.
 * Sheldon got drunk three times during the series: at the end of "The Grasshopper Experiment", "The Pants Alternative" and The Stag Convergence. In the last two, he showed a sense of humor and irony above what he normally has.
 * Sheldon apparently believes in the possibility of time travel to the past according to the beginning of "The Luminous Fish Effect", explanations of time paradoxes in "The Nerdvana Annihilation" and a point of the room-mate agreement in "The Staircase Implementation".
 * When somebody is distressed, Sheldon consoles them by saying "There, there", the only proof of his compassion towards other fellow human beings.
 * Sheldon doesn't seem to like internet memes, considering them "venality". He once gave Penny a "strike" (out of three and you're out) for sending him a picture of a cat who wants to "Haz cheezburger". He also put Leonard's e-mails in his spam folder over Leonard sending him a video of The Keyboard Cat.
 * Sheldon is scared of waking Penny before 11 A.M., because she has an "I'll punch you in the throat" rule if he does.
 * Sheldon is skilled in weaving as he is seen weaving ponchos in his apartment.
 * If nothing is approved by Sheldon, he will not go through with it. (This is seen when Leonard, Raj, Howard, and Sheldon are trying to figure out the best way to see a movie. With Sheldon not approving any ideas, the others leave him.  He responds: "They're right. It was the only option.")
 * "Prevening" - Sheldon's made up word for the hours too late for afternoon, but too early for evening.
 * Leonard had to surpass three barriers set by Sheldon in order to live with him.
 * Sheldon prefers the word "Hokum" over Bogus, Hocus Pocus, Mumbo Jumbo and Hokie Pokie.
 * He considered Amy Farrah Fowler a friend, who is a girl, but not his girlfriend. This statement, however, is moot since "The Flaming Spittoon Acquisition" when the two officially become a couple.
 * He missed getting Stan Lee to autograph his comic since he had to go to traffic court to pay a fine, but ended up in jail after he insulted the judge and refused to apologize. He then went to his house with Penny and ended up with a restraining order against him.
 * Sheldon had built a robot called Shelbot, but was eventually discarded since Penny and Leonard were quite annoyed at Sheldon's idea for doing so.
 * Sheldon owns a Flash costume which he, so far, has worn on three occasions: in "The Middle Earth Paradigm" before Penny's Halloween party before switching to a Doppler Effect patterned suit, in "The Work Song Nanocluster" when high on caffeine and in "The Justice League Recombination" when attending a New Year's Eve costume party.
 * Prior to Sheldon's date with Amy in "The Robotic Manipulation", the closest he had ever come to one was "a semi-incestuous Teens for Jesus Fourth of July Hoedown" at which he square-danced with his twin sister, Missy.
 * Sheldon once attempted to declare his and Leonard's apartment a sovereign state and even made some currency for it. This was around the time Sheldon got fired from the university and he kept changing obsessions.
 * Sheldon hates dirty socks. This is demonstrated by the time that Leonard, Raj, and Howard signed Sheldon up on a dating site and the site found Sheldon's perfect match, but Sheldon refused to go until Raj told him that he put a dirty sock in his apartment and would not remove it unless Sheldon went on the date.
 * According to Sheldon in a deleted scene/blooper in "The Maternal Capacitance" the last time his mother visited, she tried to trick him into getting re-baptized below the Santa Monica Pier.
 * Sheldon went to Johnson Elementary School until he went to college at age 11. It was there he earned the nickname, "Smelly Pooper" with kids going around saying, "Shelly Cooper is a Smelly Pooper". Amy believes this is gold for gossip.
 * When Sheldon was under the influence of Howard's mom's Valium, he revealed that his mother used to smoke in the car. While "Jesus said it was OK", they couldn't tell their dad, George.
 * Due to his good archery skills (taught to him by his father, George), Sheldon believes he would have made a great elf.
 * There are two pieces of tape on the floor in Leonard and Sheldon's bathroom. One is in front of the sink and people must brush and floss their teeth from behind this piece of tape. A second piece is in front of the toilet "for those that stand up to pee", though what exactly it marks was not specified. If someone gets the mirror or floor dirty, before Sheldon's inspection, they can lose their T.V. privileges.
 * As part of the roommate agreement created by Sheldon, Leonard has to wash his feet in a special tub before he gets in the bath or shower.
 * The tentative title for his future autobiography is You're Welcome, Mankind.
 * He had a Somalian pen pal who was kidnapped by pirates.
 * Sheldon has to be knocked out by an anesthetic when he goes for a cleaning at the dentist, as he bites.
 * In 1998, Sheldon bought a Tamagotchi and it is still alive.
 * Both Howard and Sheldon first connect with their girlfriends over the personalities of their mothers.
 * Considering his high intellect, lack of knowledge of social regulations, and habitual and obsessive personality, it is possible Sheldon has Asperger's Syndrome or some other condition in the Autism spectrum.
 * In kindergarten, Sheldon recited Pi to a thousand places for the school talent show.
 * In "The Bakersfield Expedition", Sheldon dressed as the Star Trek: The Next Generation character, Lt. Data.
 * He might have aquaphobia (fear of water) per the episode "The Friendship Algorithm".
 * Sheldon sometimes reverts to his Texan upbringing and uses expressions and ideas from his mother and father that are not as acceptable in the 21st century. (Women are like an egg salad sandwich...), (Swatting Amy on the behind and calling her a great gal.)
 * As a child, Sheldon was not allowed to do his homework until after he watched football with his father.
 * Sheldon can speak Hawaiian.
 * It's implied that Sheldon admires Madame Curie, as he put her in the collage for his screensaver along with Stephen Hawking and Amy.
 * Sheldon meets James Earl Jones who likes Sheldon and he takes him out on a night on the town instead of having a restraining order issued against him as Leonard Nimoy, Carl Sagan, Stan Lee, and Bill Nye have done.
 * In 2012, scientists at CERN actually DID find a new particle, and after additional research, confirmed that, in fact, the Higgs boson has been found such as Sheldon had been working on.
 * Sheldon's abstinence from alcohol may have been an afterthought by the writers early on. In the pilot episode, when Leonard introduces Penny to the gang, he is seen drinking a beverage in a brown bottle with his dinner, which is presumably a beer.
 * Another bad habit of Sheldon's is that he reveals himself bad events that he could have gotten away with, such as cleaning Penny's apartment at night, which Penny figured out that it was Sheldon by leaving a list for her closet, and a video message for Kripke after pranking him and inadvertently the University president and board of directors, something he could have easily gotten away with.
 * Liev Schreiber - Prototype Sheldon? = He plays a scientist which has few people skills and is working on a weather model that leads him to find holes in time. Physics, time travel, alternate realities, all things that Sheldon is interested in. He looks like he could be Sheldon's brother and often had that squinty eye look while trying to figure out something or when his friends confused him. From the movie "Kate and Leopold".
 * The life-model for Sheldon may have been found in the person of physics wunderkind Taylor Wilson, whose life and achievements are remarkably similar, right down to coming from much the same region of the USA to the little matter of illegally stored yellowcake uranium used to fuel the working nuclear reactor in the garage - which Taylor built at age fourteen...
 * Sheldon's sexuality remains largely a mystery for the first three seasons. It was presumed by most that Sheldon was asexual, which is a lack of sexual attraction to anyone. This is shown when Penny asks what Sheldon's "deal" is, (girls, guys, sock puppets?) In which Leonard responds that they have been operating under the assumption he has no "deal." When Penny insists everyone has a deal, Howard responds "not Sheldon." However, as his relationship with Amy Farrah Fowler develops it appears that Sheldon is perhaps demisexual, which is a largely unrecognized and rare sexual orientation, which is characterized by a lack of sexual attraction towards any person unless they become deeply emotionally or romantically connected with a specific person (Amy). Sheldon appears to feel at least a small amount of sexual attraction towards Amy (most notably in "The Locomotive Manipulation", season 7, episode 15)
 * Sheldon is very fond of cats, having owned one as a child and having adopted several when his relationship with Amy temporarily ended. Although Sheldon has issues touching most people, places, things, and animals Sheldon appears to have no issues with touching cats, despite being allergic to them.
 * Sheldon's IQ of 187 points places him in a very small fraction of a percent of the most intelligent people in the world. An IQ score is a normalized, scaled representation of the percentage of people that are at least as "intelligent" (as measured by the test) as the scored person. Current IQ tests are scaled to 15 points per one standard deviation (all IQ tests have 100 assigned to the population mean score), older tests (e.g. the popular Stanford-Binet Test) have 16 points per st. deviation. Assuming Sheldon's score is on a modern test, an IQ of 187 means a person with such an intelligence level occurs approximately once per 300 million individuals, i.e. Sheldon is in the top 25 smartest individuals on the planet (using 7.25 billion as the human population of the Earth). If his score were on a SD-16 test instead, he'd have a 1 in 37 million intelligence, and there would therefore be some 200 individuals as smart as or smarter than him in the world.
 * However, it is true that all IQ tests are highly imprecise for extreme values such as Sheldon's (owing to the very small number of people who can achieve such a result, rather than because of bad test design).
 * An SD-15 test would assign an IQ of 195 to the smartest individual (i.e., the one with the best result) on the planet (and 194 to the next smartest); an SD-16 test would assign 201 or 202 to the smartest individual.
 * Leonard and Sheldon are similar from The Odd Couple. Sheldon is similar to Felix: both are neat freaks and never let things go; difference is that Sheldon is incredibly arrogant and selfish sometimes than Felix.
 * Sheldon has an engagement ring that he keeps in his drawer. This ring is revealed to be a maternal family heirloom that was temporarily lost when his Nana had her finger cut off by Comanches. After it was reclaimed, the ring was passed down from generation to generation, until Sheldon received it from his mother.
 * Fun fact: there is a Cooper City in Texas, near Dallas/Fort Worth.
 * In "The Pancake Batter Anomaly" (S1E11), Sheldon said at the age of 15, he got sick in Germany, and his mother had to fly back to Texas to help his dad at that time. This creates a continuity error in the episodes "The Thanksgiving Decoupling" (S7E9) and "The Proton Transmogrification" (S7E22) because Sheldon mentions to Bernadette's father Mike and to the ghost of Professor Proton, respectively, that his father died when he was 14.
 * Sheldon, Leonard, Howard and Raj are the only characters of the current main cast who have appeared in every episode. Howard and Raj did not appear in the "Unaired Pilot".
 * Sheldon always has a habit of putting himself into Leonard's romances, either because he believes Leonard will do something to screw it up, he isn't very considerate of their [Leonard and the woman's] thoughts on it, or he simply does it for no good reason at all other than force of habit.
 * Like Penny, Sheldon has/had commitment issues, but in his case, it's not/wasn't as severe, given that he took Amy's hand ("The Countdown Reflection"), initiated his first make out session with her ("The Locomotive Manipulation"), said "I Love You" before she could say it to him ("The Prom Equivalency"), planned on proposing to her ("The Commitment Determination"), and voluntarily decided on having coitus with her ("The Opening Night Excitation"). These examples also prove that despite Amy being ahead in the relationship, Sheldon is the one who takes all the major steps.
 * The origin of his knock started after he found his father in bed with a strange woman. Afterwards, he always knocked three times to give people enough time to get their pants on.
 * Sheldon Cooper born and raised in Texas and he doesn't have a Texas accent. He sounds more like Frasier Crane and sounds more like a Connecticut country club snob.
 * Considering Sheldon's personality, it could be entirely possible that he did have one as a young child, then studied elocution to rid himself of it when he realized that it was, as southern comedian Jeff Foxworthy has joked, "not the world's most sophisticated accent."
 * Sheldon has a lot of paychecks that he never deposited in a bank or even used in "The Excelsior Acquisition". Never explained why he didn't use his paychecks to pay his bills, his taxes and his insurance and mostly the rent. How did he stay in that apartment he didn't pay or have any utilities without his using his paychecks to deposit? Only one answer is Leonard, Leonard is the only one supporting him.
 * Sheldon and Amy had sex once a year until they got married.
 * Sheldon got his driver's license two years ago, but never drove because he likes to be chauffeured around, believing it makes him feel important. Actually Sheldon got his driver's license in season 2, but never drove. The streets will be safer if he doesn't. Amy respects his wishes that she chauffeured around.
 * Sheldon is right-handed.
 * Sheldon skipped kindergarten.
 * Sheldon loves trains.
 * Sheldon's favorite type of cake is a 3 layered chocolate cake with strawberry frosting, as revealed in the episode "The Celebration Experiment".
 * His father used to give him archery lessons, by force though.
 * He emails Penny his bathroom schedule once a week, even though Penny has clicked unsubscribe "like a thousand times", he still continues to do so.
 * He considers Stuart to be his 9th favorite person.
 * He has a fear of nets.
 * He used to have a fear of mailmen.
 * He and his mother have an agreement that Sheldon would go to church at least once a year every year.
 * He enjoys reading and collecting comic books.
 * Since his mother believes in God and since Sheldon's religion allows him to celebrate Christmas it is most likely that Sheldon is Catholic, however Sheldon does not believe in or celebrate religion of any kind though.
 * Sheldon's favorite Star Trek character is Spock.
 * He doesn't drink coffee because before he left California he promised his mother that he would never do drugs, including coffee, however coffee isn't a drug.
 * He drinks hot chocolate, but only in months with an R in them, meaning he only drinks hot chocolate in January, February, March, April, September, October, November, and December.
 * His beverage of choice is moot.
 * Sheldon has an Eidetic memory, which can sometimes "be a curse" as he was able to remember the lyrics to the song "We will rock you".
 * Raj once used the little rubber part of Sheldon's tooth brush to pick food from his teeth and massage his gums.
 * He has to shave every 11 days.
 * His favorite character in "The Simpsons" is Lisa Simpson.
 * He has never touched Stuart.
 * His testicles descended when he was 15.
 * He has claustrophobia, a fear of small spaces.
 * If his career in physics hadn't worked out, his original plan was to become either a professional ticket taker or a hobo, due to his love of trains.
 * When Sheldon discovered that trains could prove Newton's first law, he felt like Neil Armstrong on the moon alone and happy.
 * His favorite number is 73, he also has a purple shirt and a blue shirt, both with the number 73 on it in a white circle.
 * Sheldon is a big fan of the Flash, as he has many Flash comics in his room, he has many Flash shirts, which he often wears, and he has a safety deposit box which he keeps comic books in some of the Flash, and was upset when he lost a bet to Howard and had to give one of his Flash comics to him.
 * He owns nine pairs of pants and nine pairs of underwear.
 * He doesn't take the bus when he is sick because he believes that when he pass out, he will wake up with his organs missing.
 * He doesn't think that Geology is a real science, as he considers it to be "The Kardashian's of science."
 * He wants 15 kids with Amy.
 * His favorite color is blue.
 * His favorite flavor of ice cream is vanilla.
 * Sheldon has been shown to have a disliking towards swearing, however he sometimes swears.
 * He and Amy have the same blood type.
 * Sheldon can do the splits, although he may have lost this ability since he was 9 years old when he displayed this talent.
 * Sheldon has synesthesia as revealed in "The Sales Call Sublimation", when he indicates that to him, numbers and tastes can smell and look certain colors or things, such as the color pink and the smell of gasoline for twin prime numbers.
 * Sheldon Cooper has a fear of living alone.