''Series/TheBigBangTheory''

[[foldercontrol]]


[[folder:0-A]]
* FourOneNineScam: A "Nigerian prince" offers to track Sheldon's stolen ''VideoGame/WorldOfWarcraft'' equipment for a fee.
* AboveTheInfluence: Leonard in "The Middle-Earth Paradigm". After a brief confrontation between Leonard and Penny's ex at her Halloween party, Penny visits Leonard in his apartment a little drunk and upset over what happened. Leonard ends up comforting her and she starts kissing him. While obviously enjoying it, he pulls away:
--> '''Leonard:''' Does the fact that you've been drinking and that you're angry at Kurt have anything to do with this?\\
'''Penny:''' It... might. ''(sigh)'' Wow, you are really smart!\\
'''Leonard:''' [[SarcasmMode Yeah, I'm a FREAKING genius]].\\
'''Penny:''' You are so great, why aren't all men like you?\\
'''Leonard:''' Because if all men were like me, [[SelfDeprecation the human race wouldn't survive!]]
** [[spoiler:Subverted in the third season finale where a drunken Penny takes Leonard to bed, though he did genuinely mistake it for a desire to get back together and was upset when that wasn't the case]].
** In "The Hesitation Ramification" Penny is drunk and depressed because her part in a TV episode gets cut and she [[spoiler:proposes to]] Leonard. He turns her down but questions himself later.
* AbusiveParents: Everyone has some parental issues, the severity of which depends on the individual and how one might view the act.
** Leonard grew up in a household of academics, his mother in particular never gave him any affection or compliments for his achievements and his father seemed more interested in his anthropology work. His mother used him as a test subject for her various theories and experiments. [[spoiler:She also used his ping pong paddle to spank his father in a sexual act and Leonard walked in on them, but for years believed it was a dream]]. And despite having some siblings he admitted the only relative he liked was an uncle who, just moments prior, he learned had died.
** Howard is a BasementDweller in part because his mom guilt trips him anytime he makes an effort to move out. Even their polite conversations end up [[NoIndoorVoice done at full volume]] while they are normally [[JewsLoveToArgue screaming at one another]]. And that's not including the emotional damage of his [[DisappearedDad father leaving with no contact]].
** Raj has the typical demanding Asian parents, but he otherwise seems to get along with them. He does mention that because his father worked a lot and he had a lot of siblings he was neglected.
** In Sheldon's case he perceives his mother as overbearing and ignorant of his prodigy nature growing up. The truth is she [[ParentsAsPeople dealt with Sheldon with the only tools she has available]] and despite everything Sheldon is, they are still very close. She's the only one who can override Sheldon's quirks and (partly related) is beloved by most of the other cast.
** Penny is still on good terms with her dad, although there are some moments shown that he likes to give his opinion on her direction in life and the people she hangs out with (he hated her typical ex-boyfriends but really liked Leonard before even meeting him). Although it seems a lot of their problems stem from [[WellDoneSonGuy Penny believing he is disappointed in her]] when [[PoorCommunicationKills he just wants to be informed]].
** Bernadette's parents were so busy with work that she was the primary caregiver to her younger siblings. They only way she could handle them was a lot of yelling and punishments, which has left her with less than positive feelings towards children and about becoming a mother herself. On top of that were the fears associated with her father being a cop.
** Amy's mother, based on what Amy has said about her, switched her attitude towards her daughter 180 degrees at some point. When Amy was younger, her mother, in an effort to protect her *ahem* virtue and keep her from bad influences, stopped her from having any friends or developing any social skills. But as an adult, she changed her focus to trying to get Amy to shave her legs and go on dates and the like.
* AccidentalHero: Sheldon on multiple occasions. He really liked Leonard's girlfriend mid-Season 2, Dr. Stephanie, and thus worked extra hard to try and make their relationship work. It got to the point he hacked Leonard's Website/{{Facebook}} profile and sent a relationship request; when Leonard found out, he was furious, although it turned out okay when Stephanie confirmed the request. When Leonard and Penny broke up late Season 3, it was his antics trying to be with both Penny and Leonard that ended up getting the two back to being friends.
** Then there was the time he unintentionally sabotaged Leonard's relationship with an Asian co-worker. As it happened, she turned out to be a North Korean spy trying to exploit Leonard's national security clearance. Sheldon drove her away before Leonard revealed anything really important.
* AccidentalKiss: When a drunk Rajesh attempts to kiss Bernadette, Howard gives a BigNo and interposes himself between the two. And he doesn't kiss his girlfriend.
* AcquiredSituationalNarcissism: Rajesh, episode "The Griffin Equivalency." At the least, he is drunk throughout most of the episode, and when drunk, he tends to be somewhat insufferable regardless of the situation.
** Howard claims he's insufferable even when he's not drunk, but because of his [[CannotTalkToWomen selective mutism]], Penny just doesn't hear it.
* ActuallyPrettyFunny: Sheldon almost never laughs out loud, usually managing an idiosyncratic snicker at something that might amuse him or maybe a guffaw at one of his own jokes. But one of the more silly jokes on the show involved an extended scene with Penny mocking Leonard with a "stupid" voice (for thinking her history paper was going to fail when she actually got a B-) and then we cut to Sheldon, laughing hysterically because "[[InsufferableGenius That's exactly what you sound like!]]"
** Raj's speaker shirt in "The Excelsior Acquisition", when Sheldon finds out about a ticket for running a red light.
--> '''Sheldon:''' I'm not going to pay a fine, that would imply I'm guilty.
--> '''Howard:''' You '''are''' guilty.
--> ''[Raj plays [[http://www.youtube.com/watch?v=-8lDYrvTILc Law and Order sound effect]] on his shirt]''
--> '''Howard:''' That one I liked.
** When Kripke fills Sheldon's office with helium while the latter is doing an NPR interview, the entire cafeteria laughs their ass off, including Leonard, Howard, and Raj.
-->'''Sheldon''': You ''laughed''?
-->'''Leonard''': I fell to the floor.
* AdamWesting: Creator/WilWheaton.
** A lot of the guest stars that play themselves are this. Levar Burton pops up as kind of a mooch. Easily showing up at fans request with the promise of food.
** James Earl Jones shows up milking his role as Darth Vadar not missing an opportunity to hang out with a fan which includes door bell ditching Carrie Fisher's House. Fisher is somewhat a stretch showing up at the door with a baseball bat, but not much.
--> James Earl Jones: "Let me guess... You love Star Wars"
--> Sheldon nods head
--> Jones: "You are aware I've done other movies"
--> Sheldon nods head
--> Jones" You don't care about those other movies"
--> Sheldon Shakes head
--> Jones: *''{{Beat}}''* "I love Star Wars too"
* {{Adorkable}}: The ''series.''
* AdvertisingCampaigns: To promote the Season 4 move from Monday to Thursday nights, the gang is seen sitting around eating food when Sheldon announces that he invented a transporter to help them move from Monday to Thursday. Everyone 'beams out' of their chairs then 'beam back in' in the exact same positions. Leonard notes that it doesn't feel very different, while Howard complains that his food is now cold.
** In 2011, American cable channel TBS bought the rights to air ''Series/TheBigBangTheory'' and advertised it by showing a clip from ''WesternAnimation/FamilyGuy'' of Peter jumping into midair and getting frozen there. After he says "Call a Scientist!", we cut to a clip from ''Big Bang'' of Leonard answering the phone. Oddly enough, the footage of Peter came from an episode which only five minutes earlier had featured a ''Big Bang'' parody, complete with [[InkSuitActor stars Jim Parsons and Johnny Galecki]] voicing their characters.
* AdviceBackfire: Inverted -- When Stuart is about to go on a date with Penny, Leonard deliberately gives Stuart what he thinks is bad advice about what to do on the date. Stuart follows the advice and ends up making out with Penny anyhow. Penny called out Leonard's name rather than Stuart's, though, and since the advice was exactly what Leonard had done himself, the implication is that Penny was simply trying to replace Leonard with someone very similar.
* AFoolForAClient: Sheldon represents himself when he receives a ticket for running a red light. He loses.
* AfraidOfNeedles: Leonard is so afraid of having to get stitches for his hand that he vomits -- and when Howard sees them, he nearly does as well.
* AllGermansAreNazis: Subtly invoked to nip Sheldon's bachelor party suggestion in the bud;
--> '''Sheldon''': You know, Germans have an interesting pre-wedding custom--
--> '''Howard''': Then it probably isn't for me!
** Well, more to do with the fact that Howard's family fled from Europe during the War and included Holocaust survivors. Not to mention that Amy's reaction to the news that Bernadette's family were once their neighbors in the same village, subtly implying that [[FridgeHorror they might have sold them out]].
** Also subtly invoked in a TBS commercial for the show, as part of the "What does TBS stand for?" series of ads:
--->'''Sheldon:''' It stands for "Text Bau Steine."
--->''(Scene switches to episode clip)''
--->'''Sheldon:''' The Germans have always been a very comforting people.
--->''(Ad cuts to Howard giving the camera a "'''Really?!'''" sort of look)''
* AllGirlsWantBadBoys: Penny seems to be attracted to muscular and obnoxious guys (Kurt from the pilot episode and the unseen boyfriend of the first season finale) and subsequently hates herself for it. One of the main reasons she gives Leonard a chance is that he was so far removed from the previous guys she would date.
** Inverted in "The Flaming Spittoon Acquisition" with Sheldon, Amy, and Stuart. Stuart asks Leonard about Sheldon and Amy and, after being told that they're not dating, asks Amy out. Stuart and Amy go on two dates before Sheldon charges back and asks Amy point-blank to be his girlfriend.
** ''The Barkersfield Expedition" has Amy declare that she likes bad boys, prompting Penny to snark back "as evidenced by your boyfriend and his fear of hamsters..."
* AllJustADream: The majority of [[spoiler:"The Recombination Hypothesis" consisted of Leonard daydreaming/wargaming a date with Penny]].
* AllPsychologyIsFreudian:
** Leslie (not to mention Howard and Sheldon) is convinced Penny's addiction to ''Age of Conan'' is a result of sexual frustration.
** Averted and played straight by Leonard's mother, a psychologist (and TVGenius ala Sheldon), who acknowledges briefly that many of Freud's theories are obsolete. [[RuleOfFunny She still uses informal Freudian analysis]] on Penny, Howard, and Raj, the latter of whom she insists are in [[HeterosexualLifePartners an ersatz homosexual relationship]]. They immediately begin arguing the point... LikeAnOldMarriedCouple.
* AllWomenLoveShoes: Penny, many examples.
* AlmightyJanitor: The janitor in "The Bat Jar Conjecture" solves the final question in a physics quiz competition after a casual glance. Made especially hilarious by the rest of the cast being unable to even identify it.
--> '''Janitor''': Here, I am janitor. In former Soviet Union, I am physicist. Lenigrad Polyteknika. *''{{Beat}}''* Go Polar Bears!
* AluminumChristmasTrees: [[http://www.mattyangel.com/2010/04/01/the-soft-kitty-song-from-big-bang-theory-is-real/ Turns out Soft Kitty is a real song, albeit some of the lyrics are reversed.]]
* AmazinglyEmbarrassingParents: All of the four main characters have them, Howard's mother being featured most prominently.
** Penny's dad isn't much better, constantly telling Leonard about Penny's previous boyfriends.
* AmbiguousDisorder: Sheldon. Leonard's mother Beverly. Amy. They all have something going on, being exaggerated versions of every geek and aloof-genius stereotype you've ever heard of. This leads to a good amount of fan speculation that one or all have UsefulNotes/AspergerSyndrome in some form. Creator/JimParsons has also stated that Sheldon "could not have more symptoms of Asperger's" but also stated the writers have not done it intentionally and he hasn't played Sheldon that way.
* AmbiguouslyGay: Raj. His sister even admitted that his family was wondering that about him. But besides some awkward moments both in the show and [[NoodleIncident spoken of in passing]], it's made pretty clear that he isn't gay... through a series of daydreams about his attraction to Bernadette. "Dance number aside, I am SO not gay." So he may be more CampStraight.
** There was that time Leonard's psychiatrist mother described Raj and Howard as being in "an ersatz homosexual relationship".
** In the episode before he daydreams about Bernadette, however...
---> '''Raj (to Howard)''': Last night I had a dream, we got so rich from the app we made, you and I bought matching side by side mansions. [[DoesThisRemindYouOfAnything But, there was a secret tunnel connecting your front yard to my back yard.]] [[FreudWasRight What do you think it means?]]\\
'''Howard''': It means next time we play handball I'm showering at home.
** Amy has all but stated she has a big crush on Penny (and has admired both Bernadette and Priya as well), but could be interpreted as a StupidSexyFlanders in that she appreciates her own gender but is otherwise straight.
---> '''Sheldon (to Amy regarding letting Penny cut his hair)''': Amy, what do you think?\\
'''Amy''': There's not a hair on my body I wouldn't let this woman trim.
* AmicablyDivorced: [[spoiler:Penny and Leonard after their break-up. This of course causes friction when Leonard gets with Priya.]]
* AmbiguouslyJewish: Leonard. Who expresses an interest when Raj buys lobsters and prawns online for a post-Lucy binge-out.
* AmusingAlien: Sheldon Cooper is an ''Earthling'' example.
* AmusingInjuries: There is sort of a RunningGag of the characters getting hit in the face and getting black eyes in the process. Admittedly, they try to avoid the DoubleStandard and Penny is sometimes hurt on a similar level.
** Sheldon learning the hard way that one should not play bongos while walking down the stairs.
* AnachronismStew: In-universe at a Renaissance Faire the main characters attend, with historical inaccuracies discussed by Sheldon. Later, Sheldon invents Three Person Chess and adds several new pieces and rules to the game, the result being that the medieval-styled classical chess pieces can now move using golf carts, time machines, transporter pads, and jetpacks.
** After discussing the inaccuracies of the Renaissance Faire, the next time they visit at the end of the episode, Sheldon goes dressed as a ''Star Trek'' science officer, sporting a Tricorder and everything, recording the Anachronisms.
* AnalogyBackfire:
** A variation in that the analogy was horrible to begin with. Howard tried taking Leonard to a bar to teach him how to pick up women, only to fail miserably. Howard tries to shrug it off as he is normally doing it alone and Leonard is cramping his style.
--->'''Howard:''' I'm a falcon who hunts better solo.\\
'''Leonard:''' Fine, I'll sit here, you take flight and hunt.\\
'''Howard:''' Don't be ridiculous, you can't just tell a falcon when to hunt.\\
'''Leonard:''' ...Actually, you can. There's a whole sport built around it. Falconry.\\
'''Howard:''' ...Shut up.
** Raj's attempt to convince Leonard to ditch his current girlfriend (Raj's sister) for an evening in order to retrieve Sheldon's stolen ''World of Warcraft'' account:
---> '''Raj''': Bros before... my sister.
* {{Angrish}}: Somewhere between this and {{Metaphorgotten}}, Penny got really angry at Leonard checking out a history paper she wrote and rewriting it for her, trying to calm her down with an analogy of "The shoemaker and the elves." After storming out, she came back in and tried screaming at him with her own analogy and got halfway through the "Feed a man a fish" story before giving up and just calling him an ass.
* ArmorPiercingQuestion: In a girl's night out when they ended up playing "Truth or Dare", Bernadette asked Penny why she hung out and talked with Leonard so much even though she broke up with him. Penny replied that he was a great guy but felt he got too serious, which led to another question that what if she wanted him back and he was taken by someone else ''because'' he is a "great guy?" Penny didn't know how to respond to that and declared the game over.
** Sheldon delivers a ''brutal'' one to Penny when she offers to give him advice about dating when she is chaperoning him to his first date with Amy:
--->'''Penny''': My point, is that if you were as smart as you think you are, you would ''listen'' to me, since I know more about dating than you.
--->'''Sheldon''': If you know so much about dating, how come ''I'' have a date tonight and you have nothing better to do than drive me to it?
--->'''Penny''': *long, stunned silence* Fair point.
** Sheldon in the Season 6 finale is trying everything he could to convince Leonard not to take a job working on a StephenHawking project on a boat. After various attempts with seafaring disaster statistics and general fear of sharks, Leonard tells him to stop it. Sheldon then points out Leonard and Penny are in a really good place right now and him leaving for 3-4 months could affect that, which obviously hit Leonard hard.
--->'''Sheldon''': I should have led with that one.
* AnythingThatMoves: The physicist Dr. Plimpton that Sheldon invites over, sleeps with Leonard, Raj, and tries to seduce Howard, who has trouble being naked in front of Raj, all within a 24 hour period.
* ArousedByTheirVoice: Raj wants Howard to tell his new [[DisabledLoveInterest deaf love interest]] that he has a deep sexy voice like James Earl Jones, not realizing she wouldn't know the appeal anyway.
** Bernadette and Howard are dog-sitting for Raj and they lose the dog. While out searching for it, they decide they should call the dog's name using Raj's accent, leading to this HoYay-packed exchange:
--->'''Howard''': When this all blows over, remember that voice. It’s kind of a turn-on.
--->'''Bernadette''': It turns you on when I sound like Raj?
* ArsonMurderAndJaywalking: Howard compares [[EpicFail the reception to one of Sheldon's lectures]] to "the Hindenburg meets Chernobyl meets ''[[Film/TRONLegacy Tron 2]]''".
* TheArtOfBraRemoval: Howard is making out with Bernadette and fumbling with her bra, only for her to tell him it unhooks at the front.
* ArtisticLicenseBiology: Sheldon. Yes, ''[[InsufferableGenius Sheldon]]''. When [[DrivesLikeCrazy he is unable to learn to drive on a driving simulation without]] crashing into a pet store or [[RefugeInAudacity ending up on the second floor of a building]], he claims that because he is the [[EvolutionaryLevels next stage in the evolution of humanity]], citing his [[WeWillNotHaveAppendixesInTheFuture small incisors]] and his massive brain, he does not need to learn how to drive, because the task is beneath him. Evolution does ''not'' work that way! Sheldon Cooper is also egotistical and occasionally delusionally convinced of his own superiority. He has been known to occasionally ignore various scientific principles in order to win arguments, particularly when it comes to superhero physics.
* ArtisticLicenseCars: Sheldon claims Penny's car's check engine light is on, and promptly freaks out. Penny's car is a 1985 Volkswagen Cabriolet, made before check engine lights were available.
* ArtisticLicenseLaw: InUniverse by Sheldon when he [[AFoolForAClient represents himself]][[note]]There's a saying when it comes to representing oneself in court: He who represents himself in court has a fool for a client. On top of this, Sheldon was photographed doing it, so he doesn't have a defense.[[/note]] and tries to fight a ticket for running a red light while driving Penny's car. His defense is little more than blaming Penny for goading him into running the light and owning the car[[note]]Because he was driving, he is 100% at fault as he could have ignored her advice; Penny, as a passenger, cannot be held responsible for his actions -- the fact it's her car is irrelevant; she wasn't driving[[/note]], claiming it was necessary and therefore legal for him to run a red light because Penny's shoulder was dislocated,[[note]]It's not, and a dislocated shoulder isn't life threatening. A life threatening injury may have tipped the balance, but it's not likely, because the police and/or judge would probably say an ambulance should have been called[[/note]] and that it's unconstitutional for a camera to issue a ticket[[note]]it's not; red light cameras are entirely constitutional[[/note]]. The judge rules him guilty, which Sheldon tries to contest through ''incredibly'' disrespectful backtalking and ends up in jail for contempt of court.
** For that matter, that's not how camera-issued tickets work. Sheldon mentions he received three demerits; in the state of California, tickets issued by red light cameras carry a fine and a maximum of one point, and even then, not all violations are issued with a point.
* AscendedExtra / DemotedToExtra: Leslie Winkle showed up three times in the first season, and her character was liked enough that the production team announced her as becoming a regular early in the second season. After about four episodes in, they quickly realized that she worked largely because she was a staunch, stubborn ArchEnemy to Sheldon with no real room for her own stories or even CharacterDevelopment. They quietly put her character aside and she shows up more sporadically since.
** Both Bernadette and Amy Farrah Fowler started out as sporadic recurring characters introduced in the third season and given their own little plot lines in the fourth. While they may not always show up unlike the core 5, they are credited as stars in the episodes they appear, and have appeared much more frequently than before. Starting from Season 5, they can be expected to appear in any given episode and get just as much focus as any of the other characters.
* {{Asexuality}}: This is Sheldon's "deal." He's familiar with the concepts of physical or romantic attraction, but doesn't apparently experience those things himself. Any time he "clicks" with someone in a romantic way, it is always juxtaposed with a common scientific enthusiasm. While the possibility of sexual attraction has appeared from time to time (when Amy kisses him in Season 4, he says "Fascinating", which ''could'' indicate that he found the experience pleasurable or at least interesting), he is written largely as someone who puts intellect and science first and mocks his friends for not doing the same.
--> '''Leonard:''' I can't believe you're going to have Howard choose between sex and ''VideoGame/{{Halo}}!''\\
'''Sheldon:''' No, I'm asking him to choose between sex and ''VideoGame/{{Halo 3}}''. As far as I know sex hadn't been upgraded to include hi-def graphics and advanced weapon systems.\\
'''Leonard:''' Right, all sex has is nudity, orgasms, and human contact.\\
'''Sheldon:''' [[SarcasmBlind My point.]]
** In a Season 5 episode, Penny falls in the shower and breaks her arm. She calls for Sheldon to help, because she knows the sight of her naked would literally do nothing for him. In fact, Sheldon spends more time whining about the possibility of getting injured driving than appreciating the fact that he got to enjoy Kaley Cuoco "in the altogether."
** Similarly, his [[SheIsNotMyGirlfriend Not-Girlfriend]] / DistaffCounterpart Amy Fowler refuses to touch or have sex with him. But as she hangs out with Penny, she displays more signs of sexual repression rather than straight asexuality, along with hints towards [[BiTheWay seeing the appeal of either side]]. Further realized when Amy gets roaring drunk and demands to know what or how much it would take for Sheldon to "take her to that skeezy motel and have his way with her."
* AskAStupidQuestion: When Penny locks herself out of her apartment and has to call a locksmith, Sheldon asks her if she would like to wait in the guys' apartment.
-->'''Penny:''' No, Sheldon. I would rather sit on this freezing floor, sobbing like a three year old.
-->'''[[SarcasmBlind Sheldon]]:''' Oh, okay. (Goes inside. Penny sighs in exasperation and runs in.)
** In "The Large Hadron Collision," Penny is throwing up in the bathroom when Leonard asks what's going on.
--->'''Penny:''' I'm having a tea party, what do you think's going on!?
* AstonishinglyAppropriateInterruption: In the second Season 5 episode, Amy Farrah Fowler is playing the harp and singing "The Girl From Ipanema" when Sheldon pays her a visit.
-->'''Amy:''' "When she walks, she's like a samba that swings so cool and sways so gentle that when she passes, each one she passes goes..."
-->'''Sheldon:''' (Knock, knock, knock) Amy? (Knock, knock, knock) Amy? (Knock, knock, knock) Amy?
** Also [[InvokedTrope invoked]] by Penny, who knows that Sheldon always knocks on her door in a certain way with three knocks and then saying her name:
--->'''Sheldon:''' (Knock, knock, knock)
--->'''Penny:''' WHO DO WE LOVE?
--->'''Sheldon:''' Penny?
** Sometimes Penny has clever responses for Sheldon:
--->"What's the gist, physicist?
* AsYouKnow: Lampshaded by Sheldon when Leonard is filling him in on developments in the A plot as a lead in to part of the B plot (specifically that of Howard and Bernadette getting back together):
--> '''Sheldon''': Why on Earth are you telling me all this?\\
'''Leonard''': I don't know... sometimes your movements are so lifelike I forget you're not a real boy.
* AttentionDeficitOohShiny: Sheldon. Penny sometimes, most often when she attends any of their science lectures but there is also this gem "My mother smoked pot when she was pregnant with me and I turned out fine... Oh, more wine!"
* AuthenticationByNewspaper: When Leonard is getting ready to go to the Bakersfield ComicCon, he takes a picture of him kissing Penny's cheek while she holds the day's paper to prove to the other attendees that he not only has a girlfriend but that she is also hot.
* AuthorVocabularyCalendar: Sheldon and Amy might have a game in which they decide on their word of the day. In "The Desperation Emanation", they choose 'cornucopia' and 'mellifluous' for the next day.
[[/folder]]


[[folder:B]]
* BadBadActing: Sheldon and Amy trying to put on a web series "Fun with Flags." They always stare straight into the camera, even when having a "conversation" with each other.
* BadLiar: Never, ever get Bernadette to lie. It will [[SuspiciouslySpecificDenial go]] [[HurricaneOfExcuses very]] [[ActingUnnatural badly]] [[InventionPretension indeed]].
** Sheldon is not a very good liar either. In "The Lizard-Spock Expansion," Leonard is going to sneak out and see Stephanie, but he tells Sheldon to tell Raj and Howard that he is going to the office. Sheldon's delivery of this line is very unconvincing due to his unnecessary emphasis on the word "office" and his exaggerated innocent expression.
*** Though it turns out that Sheldon is only bad at coming up with a lie on the spot. If given ample time, not only can he come up with a plausible and convincing lie, he can even come up with falsified evidence to support it.
* BarrierBustingBlow: Penny is casually climbing upstairs, minding her own business, when Sheldon and Leonard's door bursts apart and a killer robot of their own invention rampages into the hallway, making her flee in terror.
** Howard tries to perform one, but just [[EpicFail bounces right off the door]].
* BasementDweller: Howard, only without the basement apartment. He essentially lives like he's still 15 for American standards. The norm of an adult Jew still living with their mother is even commented upon several times.
** Though this seems to be more his mother hanging on to him than him wanting to stay though in his mind he likely does want to stay.
* TheBeard: Penny asked Leonard to pretend that they are still together when her father came to visit, because Leonard is "the first guy he ever approved of. [[LongList You're a scientist, you went to college, you don't have a neck tattoo or outstanding warrants... or a baby.]]" Leonard, delighting in the irony, proceeds to make out with her at every opportunity.
** Amy asked Sheldon to pretend to be her boyfriend so that her mom would get off her back. Sheldon initially confused it for an invitation to actually ''be'' her boyfriend, and was relieved when that wasn't the case. As they meet her mom over web cam, he made certain to talk about [[HaveIMentionedIAmHeterosexualToday how much sex they have together]].
** Raj is set up by his parents with an Indian girl who admits she is a lesbian and wants to marry him to dispel suspicion. A twist is that she (and others, including his friends and parents) think that Raj is in the closet as well so it would be a mutual beard relationship.
** This was the excuse used by Sheldon when he discovered [[spoiler: that Kripke was further along in his research than Sheldon was. When Kripke calls him out on this, he gives Sheldon an out by stating that Sheldon must be DistractedByTheSexy. Sheldon, not willing to admit his mental inferiority to Kripke , readily agrees. He then goes into extremely inaccurate detail about his sex life.]] Includes the gem "I gave her genitals a good rogering."
*** In this same scene, when Kripke asks if they use "toys" meaning the adult sense of the word, Sheldon naturally assumes he is talking about his collection, not making the connection.
--> '''Kripke:''' What about toys?\\
'''Sheldon:'' Well, yes, there's lightsabers and action figures...\\
'''Kripke:''' You're a FREAK, Cooper!
* TheBechdelTest:
** Narrowly succeeds. Penny being the sole prominent female character, it was to be expected but the later addition of Bernadette and Amy to the cast, gives the girls more opportunities to occasionally speak about something else than men. Relationship issues usually comes up with their various get-togethers, as each have a romantic counterpart on the guys side, but on the whole they aren't always just talking about men (they actually had a "Truth or Dare" game where Penny ended it when they asked some uncomfortable questions about her feelings for Leonard).
** Initially, the "girl group" was largely there to provide a female perspective on the guys story or help define their relationships with the guys via their gossip. Eventually, it developed to be more about their own interactions (such as Amy giving Penny a [[UnwantedGiftPlot gaudy painting of the two of them]]) or otherwise have their own story with little to no connection to the guys. An interesting episode had the girls take the day off work to go to Disneyland and they got DisneyPrincess make-overs (Penny just wanted to get drunk and go on rides), while in the midst of that Sheldon called Amy and Bernadette over the phone to give a short speech over female roles.
** Referenced in the Season 7 premiere. Amy and Bernadette attend a biology conference together and note that they enjoy being able to have intellectual conversations with each other since they usually only talk about boys when Penny is around. Immediately subverted when some guys buy them drinks and they immediately dissolve into puddles of boy-crazy-ness.
* BedmateReveal: In the final episode of Season 4, Raj and [[spoiler: Penny]].
* BerserkButton: Howard Wolowitz doesn't like being reminded that he doesn't have a [=PhD=]. Every time he tries to start something, Leonard tells him to sit down and he complies. He might not have a [=PhD=] but he recognizes he's too puny to do anything about it.
** Sheldon has numerous examples:
*** Perhaps it would be best to begin with an in-universe listing...
---> '''Raj:''' What did you do? Did you change the contrast or brightness settings on the television?
---> '''Leonard:''' No.
---> '''Raj:''' Did you take a Band-Aid off in front of him?
---> '''Leonard:''' No.
---> '''Howard:''' Did you buy generic ketchup, forget to rinse the sink, talk to him through the bathroom door?
---> '''Raj:''' Adjust the thermostat, cook with cilantro, pronounce the T in often?
---> '''Leonard:''' No!
---> ''({{Beat}})''
---> '''Howard:''' ...Did you ''make fun of trains?''
*** Don't mention Creator/WilWheaton around Sheldon, unless you want a "WHEEEEEAAAATOOOOOONNN!" that would make [[BigWordShout Shatner proud]]. They made up at the end of "The Russian Rocket Reaction" and are now good friends (according to Sheldon, anyways). Unfortunately, Creator/BrentSpiner then inadvertently replaces Creator/WilWheaton on Sheldon's Mortal Enemy list.
*** And don't sit in Sheldon's spot on the couch. You will regret it.
*** While Sheldon is perfectly fine with cheap shots aimed at his mother, ''do not insult his Meemaw.''
*** Being let down by his friends, but ''especially'' Leonard, is another one. After Kripke humiliated him on NPR, his misery is compounded when he finds out Leonard laughed.
*** Sheldon usually doesn't resort to physical violence, but question the legitimacy of his work and back up your claims with tangible proofs and all bets are off.
*** The following exchange:
--->"You want me to share credit?"\\
"Yes."\\
"[[GetOut GET OUT.]]"
*** A minor example, but only his mother and sister are allowed to call him "Shelly".
*** Amy is a new one -- Sheldon actually physically assaulted Leonard (via a karate chop to the neck), when he mistakenly believed that Leonard had been up to something with her.
*** Four words: "'''[[http://www.youtube.com/watch?v=jH0Q8NOsIR8 YOU USED MY TOOTHBRUSH?!]]'''"
** Though not quite as insane as Sheldon, Bernadette is a walking panel of tiny berserk buttons. Try and dress as Cinderella when she called it.
** More Hysteric Button, but Raj collapses in panic when anything threatens his residency status and the prospect of having to return to India looms.
** Leslie Winkle will do anything to show up Sheldon if he's mentioned.
* BestedAtBowling: Sheldon, by Creator/WilWheaton.
* BestialityIsDepraved: What Raj believes "get back on the horse" means.
-->'''Raj''': I'm telling you dude, the only way to make you feel better about Penny going out with other guys, is for you to get back on the whores.\\
'''Howard''': ... "horse".\\
'''Raj''': What?\\
'''Howard''': The phrase is "get back on the horse"... not "whores".\\
'''Raj''': That's disgusting, dude!
* BetaCouple: Both Bernadette/Howard and Amy/Sheldon are relatively stable compared to Penny and Leonard's relationship. As of "The Herb Garden Germination", [[spoiler: Howard and Bernadette are engaged]] -- and in the Season 5 finale, [[spoiler:they tied the knot.]]
* BetweenMyLegs: This shot is used with Penny's legs framing a remote control car with a camera that's trying to see... well, between her legs.
* BewareTheNiceOnes: Bernadette, several times in Season 5. In "The Skank Reflex Analysis", when she snaps on Raj, after Leonard reveals to the group Raj's crush on her. Bernadette flips out and angrily confronts Raj, berating him to tell Howard that nothing is going on between the two of them. This is somewhat Lampshaded in the scene.
** In "The Recombination Hypothesis", Bernadette flat-out states to Howard that she is [[{{Yandere}} a "vengeful person" and has access to "weaponized smallpox" if Howard were to ever hurt her]].[[spoiler: Although, at the end, it's revealed that Leonard was imagining most of the episode, including this comment from Bernadette]]
** Bernadette, when pushed far enough (which doesn't take much due to her short temper), screams/talks in the same manner as [[TheUnseen Howards's mother]]; he finds this sexy. Although Bernadette is more of a [[CuteAndPsycho Yangire]] than an actual nice one.
** Penny assumes her friend Emily is automatically nice because she's deaf, and people with disabilities can't afford not to be kind to everyone. Not quite.
** Bernadette with children.
* BigBadassBirdOfPrey: Sheldon's perception of the avian creature hanging out on his apartment windowsill, in 'The Ornithophobia Diffusion' (he calls it a "blue jay", thus proving bird identification is not his forte' -- it's a [[http://en.wikipedia.org/wiki/Black-throated_Magpie-Jay black-throated magpie-jay]].) But after Bernadette finds the bird and demands that he give the creature a pat, he reluctantly goes along with it, and with no negative results, Sheldon does a HeelFaceTurn and loves the bird.
* BigBookOfWar: The Roommate Agreement
* BigBrotherInstinct: Sheldon briefly becomes [[KnightTemplarBigBrother very protective]] of who his twin sister dates, though subverted as its only because he comes to the conclusion that residing in her loins possibly lies the potential building blocks for her to have an offspring who is ''another'' remarkable individual like himself; Sheldon 2.0, if you will.
** Cue one GroinAttack from Missy.
* BigDamnHeroes: Sheldon describes this trope as well as merging it with ChangedMyMindKid to explain a resolution when Raj was getting downsized and possibly deported.
--> Like the supporting character in a movie where they disappear for much of the second reel, only to return in the third act coming to the rescue, I have a solution... (complete silence) Odd, they usually cheer.
* BigNo:
** Sheldon lets one out when he realizes that he locked himself out of his apartment, ruining his perfect night alone.
** Sheldon when a "terrifying" song bird flies through the apartment window and lands on his couch space.
** Raj when he gets too attached to the female voice on his phone, has a sex-dream about her as a woman, only to find out that once again, he can no longer speak.
** Leonard gives a spontaneous BigNo the moment after Bernadette introduces her ex-boyfriend Glen, to Penny, in "The Love Car Displacement", as a ride for Penny back to Los Angeles. Leonard is understandably worried as it is strongly implied that Glen is well-endowed, and Leonard was attempting to rekindle his romance with Penny.[[spoiler: Leonard and Penny's romance *is* rekindled in Season 5, and continues at least through Season 6.]]
* BiggerIsBetterInBed: Bernadette's old boyfriend Glen in "The Love Car Displacement" is strongly implied to possess a massive cock due to his physical size. The episode revolves around the guys' notion that BiggerIsBetterInBed and their insecurities about that.
** It's strongly implied the guys were assuming Glen was well-endowed due to his race as well (he was played by Rick Fox)
* BilingualBonus: Amy Farrah-Fowler invokes this in Episode 22 of Season 4. You can still get the gist of the sentence, but Amy was called a whore in Spanish.
-->'''Amy Farrah-Fowler''': I used to take my lunch down to the maintenance room and eat with the janitor. It was nice until his wife called me a 'puta' and made me stop.
** Chinese speakers will recognize that Sheldon asking the Chinese restaurant owner to "[[MyHovercraftIsFullOfEels show me your mucus]]" in "The Tangerine Factor" is indeed a very mangled attempt to say "show me your tangerine peels".
** On the whiteboard in shot during ''The Staircase Implementation'' are references to ''B-Stoff'' and ''C-Stoff''. Anyone fluent in German who also knows a little about Werner von Braun, who designed the V1 and V2 rockets used to blitz England in 1944-45 and went on to lead the American space race, will recognize the ''x-Stoff'' references as shorthand for the various lethal components of wartime German rocket fuels. And of course, in this episode, Leonard gets hold of some NASA rocket fuel and ends up destroying the elevator with it. As surely as if he'd dropped a V-2 down the shaft.
* BirthdayEpisode: "The Peanut Reaction". After learning that Leonard has never had a birthday party, Penny decides to throw him one and drags the others into helping her. It doesn't go well, naturally. The title, for instance, refers to [[spoiler: Howard triggering his peanut allergy as a desperate attempt to keep Leonard away until the party]].
* BirthdayHater: Sheldon has some mental scars from past birthdays relating to his general aversion to socialization. Leonard is pretty apathetic as far as birthdays go because his mother didn't like the concept, but appreciates the gesture when his friends plan a surprise party for him.
* BitchInSheepsClothing: Priya, since she refused to let Penny see Leonard when they were dating, strung along Leonard when she knew that she was going back to India and [[spoiler:slept with her ex-boyfriend when she was back in India]].
** Raj can also be a bit like this. Howard lampshades it in "The Zazzy Substitution".
* BiTheWay: Amy seems to be largely heterosexual, but has made sexual overtures more than once to Penny.
** May be a case of IfItsYouItsOkay, since Amy doesn't seem attracted to any other regular female characters, despite acknowledging their attractiveness in some cases (e.g. Bernadette, Priya).
* BlackHumor: Pretty much anything involving Bernadette's microbiology research. Amy's neurobiology work with monkeys sometimes qualifies as well.
* BlahBlahBlah:
-->'''Leonard''': Are you even listening to me?\\
'''Sheldon''': Of course I'm listening. Blah, blah, hopeless Penny delusion, blah, blah, blah.
* BlandNameProduct:
** "I have no difficulty believing you're not butter."
** Leonard, Penny, and Sheldon watch an episode of ''Oshikuru Demon Samurai''. The actual dialogue heard played is from real series ''Anime/BoogiepopPhantom''. ''Oshikuru'' is a fictional anime series also mentioned in ''Series/TwoAndAHalfMen''.
** While the show accurately describes the premises of both ''VideoGame/AgeOfConan'' and ''VideoGame/WorldOfWarcraft'', any specific location, weapon, or other equipment mentioned in the show is probably fake. For now, at least; Blizzard has no problem [[AscendedMeme embracing a fictional representation]] of ''[=WoW=]''.
*** However, in "The Zarnecki Incursion," many of the ''[=WoW=]'' references were true to the game.
** If you pay attention during the cafeteria scenes at the university, the coke cans say things like "Dr Peeper".
* BlatantLies: When attempting to get information out of a male character in ''World of Warcraft'', Raj (playing a female character) sighs and volunteers, "I see where this is going. Fine. I'll have sex with him." Everyone gives him a look and Leonard responds "That's not where this was going." Raj gives the most unconvincing shifty-eyed look ever while saying "Oh. Good. Because I would hate that."
* BlindDate: Penny sets Raj up with a DisabledLoveInterest.
** Howard meets Bernadette through a blind date, after Leonard convinces Penny to have one of her friends go on a double date. It goes poorly until [[NotSoDifferent they bond over their overbearing mothers]].
** Bernadette sets Leonard up on one in Season 4. Leonard finds his date to be completely miserable.
* BlueAndOrangeMorality: Sheldon Cooper has a unique and well-developed sense of right and wrong that makes absolute perfect sense... to Sheldon. To everybody else, this can often make him come across as hard to understand, awkward, arrogant, selfish, and insensitive at times. Justified by whatever unnamed and undiagnosed personality disorder he exhibits, which makes him see the world in pretty black-and-white terms, have obsessive-compulsive tendencies, and have a general inability to understand social mores.
** His weird personal moral rigidness often comes bouncing back in surprising ways. For example, he loans Penny a large amount of money and is completely casual about when she should repay him, reasoning that it is money he isn't using and will not need.
* BluntYes: A common gag involves one character making a convoluted yes/no question, often rhetorically, only for another character to answer it bluntly.
* BodyBackupDrive: Sheldon wants to do this, but is concerned that the technology won't be ready by the time his body dies.
* BollywoodNerd: Raj milks this for all its worth, claiming to have grown up in poverty before moving to America to pursue his dream of becoming an astrophysicist.
-->'''Howard''': Your dad's a gynecologist! He drives a Bentley!
** He later admitted that he grew up in a large home with servants and according to him "We don't allow our poor people to have dreams."
* BookDumb: Although Penny is more street-smart, sociable, and tolerant than any of the guys, she's easily exasperated and put off by even trying to learn anything related to science. Except that fig Newtons are named after the town in Massachusetts, not the scientist.
** "Don't write that down!"
** This dynamic is reversed in "The Thespian Catalyst", where Penny, during an acting lesson to Sheldon, suggests they read lines from Tennessee Williams' Pulitzer Prize-winning play, ''Theatre/CatOnAHotTinRoof''. Sheldon has no idea who Tennessee Williams is, and insists they work with his own ''Franchise/StarTrek'' fanfiction.
* BreadEggsMilkSquick: Sheldon's comment during his therapy session with Leonard has this:
-->'''Sheldon:''' Let me save you some time, my answers to the standard Rorschach ink blot test are A) a bat, B) a bat, C) a bat and D) my father killing my mother with a hypodermic needle.
* BreakTheHaughty: Sheldon is sometimes caught up by karma. The rest of the gang occasionally succeeds in proving him wrong, humiliating him or shutting him up but it's subverted by the fact that he never seems to lose his arrogance. Usually, he won't admit he was wrong, even to himself, and will go through incredible contortions to maintain his self-image as perfect.
* BreakingBadNewsGently: Leonard says he's in bed when told to sit down.
* BreakingInOldHabits: Howard + cutting-edge robotic hand.
* BrickJoke:
** In one episode, Wolowitz, Raj, and Leonard reveal in a passing joke that they always thought that Sheldon reproduced asexually via mitosis. At the very end of the episode, Leonard has a nightmare about this very thing happening, after not being mentioned for half an episode.
** There's an extremely delayed one hiding in the first episode. The "200-pound transvestite with a skin condition" shows up in the flashback episode at the end of Season 3.
** In one scene, Penny is violently breaking up with unseen boyfriend. She storms to the guys' apartment, opens the window and throws out his iPod. When Raj walks in moments later, guess what he found on the street? Jackpot, an iPod.
** In "The Creepy Candy Coating Corollary", Leonard says "Warlord beats Troll, Troll beats Elf, Elf beats Water Sprite, and basically everything beats Enchanted Bunny". During Sheldon and Raj's final match with Creator/WilWheaton and Stuart, [[spoiler:Sheldon feels bad for Wil's grandma dying, so he plays Enchanted Bunny... and loses.]]
** In Season 3 episode, in the first scene, Raj, Howard and Leonard run down the stairs shouting "Kites ho!", incurring Sheldon to give a speech on the correct use of the term 'ho'. Later, when Sheldon asks why Leonard went through the trouble of learning the rules of American football so as not to embarrass himself in front of Penny's friends -- and therefore still be able to see her -- when he could have more easily paid someone else to have sex with him.
--->'''Sheldon''': Am I correct in assuming that your attempt to be accepted by Penny's peers is based on your desire to continue your mating privileges with her? Seems like an awful lot of trouble to go through for intercourse. Don't you have access to women who will do it for money? By the way, another accepted use of the term 'ho'.
** In The "Hamburger Postulate", Sheldon points out that the name "The Soup Plantation" is odd since you can't grow soup. A few minutes later, after an unrelated conversation, Leonard remarks that you can grow the ingredients for soup.
** In Penny's car, a 'check engine' light is on and people keep reminding her that she should do something about it. Finally pays off in Season 7 when Penny's car breaks down for good.
** In "The Prestidigitation Approximation", Leonard suggests the possibility of Priya wearing Raj's Uhura costume during sex. Six episodes later, Raj hears their "astronomically inaccurate Franchise/StarTrek sex" from the living room.
** In Season 6, one episode opens on Sheldon discussing the possibility of a Frisbee sized wormhole. At the end of the episode, Raj and Howard discover he's created one. [[spoiler:Turns out it's a prank.]]
** An almost-literal brick joke happens in Season 2, when Howard tests his modifications to the [[spoiler:space toilet]] [[note]]"It's classified!"[[/note]] with his mother's meatloaf. The toilet shoots the meatload upward, and it sticks to the ceiling. It falls back down, just like a falling brick, by the end of the episode.
** In Season 6, the crew of the International Space Station make Howard clean out the space-toilet he designed, as revenge for the incident back in Series 2, when it malfunctioned and covered the entire interior of the station in excrement.
** In "The Convention Conundrum", Sheldon is scared to call Carrie Fisher because he thinks she might be a little crazy. Later, when hanging out with James Earl Jones, James Earl Jones confirmed she is a bit crazy [[spoiler:from James Earl Jones ringing her her doorbell and then running]].
** Howard's exclamations of "I'm Batman!" while in full costume, which are hilarious both due to his pint-sized stature and overall imitation of Christian Bale's deep and gravelly voice in ''TheDarkKnightSaga''.
* BriefAccentImitation:
** Howard occasionally imitates an exaggerated Indian accent. For example, in “The Grasshopper Experiment” he pretends to be Raj on the phone.
** Once, when high on hippie cookies, Raj made fun of Leonard's American accent by replicating it with a surprisingly good American accent of his own.
** In the fourth season finale, Penny does a pretty good impression of Raj's Indian accent.
** Bernadette tries her hand at it in Season 6. She's rather horrified when she realizes that it [[HomoeroticSubtext turns Howard on when she sounds like Raj]].
*** (or maybe, Pryia?)
* BrainyBrunette: All of the main four have brown hair, and all have anywhere from above average to freakishly high intelligence levels. Leslie Winkle and Sheldon's graduate assistant, Alex, are female examples.
** In later seasons, we have Amy Farrah Fowler.
* BrilliantButLazy:
** ''Leonard'', at least according to his mother and Sheldon. Both express the opinion that Leonard is slumming it by doing no original research and baffled at why he's content confirming the results of experiments done by others. Leonard does point out that confirming results ''validates'' the major scientific experiments and that just because it's not cutting-edge research, doesn't mean its not very important work. When Sheldon came up with a new theory that was highly praised, Leonard was quick to remind him that he created the experiment that ''proved'' it; the scientific community wouldn't just "[[InsufferableGenius take his word for it]]".
** Sheldon seems to be a fairly accomplished cook. Amy notes that his sourdough bread is excellent and he prepares Leonard a delicious looking and pretty complex breakfast in bed (Frodo-shaped pancakes, butterscotch scones etc). Despite this, he almost never cooks (instead ordering different takeaway food every night), and Leonard usually does any home cooking, despite Penny noting that "he can't."
* BrutalHonesty: Sheldon is a practitioner.
-->'''Sheldon:''' Dr. Stephanie is the only person Leonard has dated that I can tolerate.\\
'''Penny:''' Hey! What about me?\\
'''Sheldon:''' ...the statement stands for itself.
* ButIWouldReallyEnjoyIt: Amy invokes changing the physical parameters of her relationship with Sheldon at various points.
--> '''Amy''': *''drunk''* What would it take for you to go into that liquor store, buy a bottle of hooch, then go to the motel over the street and ''have your way with me?''

--> '''Amy''': Proposal: one wild night of torrid lovemaking that soothes my soul and inflames my loins.
* ButtMonkey: All four of the main male characters, in different ways:
** LEONARD. The show has gone out of its way, particularly in recent seasons, to make his life MORE AND MORE miserable...and it's always PlayedForLaughs, regardless of Leonard's progressively damaged psyche.
** Sheldon is often on the receiving end of a lot of humiliation and punishment, not that he doesn't bring it on himself, though.
** Howard is often made fun of by everyone else (sometimes, even [[HypocriticalHumor Penny]]) for his lack of a doctoral degree, his relationship with his mother and his being a CasanovaWannabe. He was also the ButtMonkey to the other astronauts when he was in the space.
** Raj's inability to speak around women often makes him this, as he has to whisper his comments to Howard, who pretends he said something completely different.
** Stuart Bloom as well for that matter. Everything he says is [[TheEeyore depressing.]] His idea of being "cocky" is to claim that he's "unobjectionable." He can be stood up by a stray cat.
** Alex. Only natural since she is Sheldon's assistant.
* ButThouMust:
-->'''Amy''': Are you familiar with meme theory?\\
'''Sheldon''': I'm familiar with everything... but go on.
** Whenever someone is feeling bad, Sheldon will make them a hot beverage, the beverage flavor depending on the seriousness.
---> Sheldon: "I'll make you some tea."
---> Leonard: "I don't really want any."
---> Sheldon: "It's not optional."
[[/folder]]


[[folder:C]]
* CaliforniaUniversity: Averted; Caltech is of course a real (and well-known) university in Pasadena, CA. In a strange variation though, given the ages of each character it is unlikely they would have stayed with the same university as long as they have, at least since about 2002. It's largely just practical for the purposes of a show but it could also be that they are just comfortable with the [[StatusQuoIsGod current status of their careers]].
** Also averted in the sense that everyone in the cast grew up in different locations and went to school at different places, they all found a job at Caltech. Raj is from India and went to Cambridge, Howard appears to be a local but he went to school at MIT, Leonard is from New Jersey and went to Princeton, and Sheldon is from Texas and went to East Texas.
* CallBack:
** Early in the second season, you catch the tail end of a conversation Penny was having with a boyfriend of the week, where she was trying to explain SchrodingersCat to him. In the first season, Sheldon used that principle of quantum physics as an analogy towards the possibility of a relationship between her and Leonard. This also doubles as {{foreshadow}}ing, showing that Penny is starting to enjoy or at least retain the scientific concepts and mental exercises the others often explain to her.
** In the fourth season, Penny gave Leonard a surprise kiss in front of her father, trying to placate him by pretending her and Leonard were together. Leonard stumbled back into his apartment and explained what happened to the guys, and they started joking over Leonard pining after Penny again, with Raj making a direct quote from the pilot episode as a Leonard classic "Our children will be smart ''[[NerdsAreSexy and]]'' beautiful."
** In Season 1, a sick Sheldon asks Penny, who is nursing him, to sing him a song his mother use to sing to him when he was sick, "Soft Kitty." The next season, Sheldon was homesick after being locked out of his apartment and asks Penny to sing the song to him, seeing homesick as a type of sick. The following season, after Sheldon is betrayed by the guys, Penny attempts to console him with "Soft Kitty," but is interrupted by Sheldon since 'Sad is not sick.' Again in the third season, when Sheldon is taking care of Penny after she dislocated her shoulder and was doped up on pain medication, she asks him to sing the song to her. In Season 5, Sheldon's mom actually sings it to him.
** Way back when Penny and Leonard started dating, Leonard makes a reference to Music/TheBlackEyedPeas, only for Penny to point out he had no idea who they were until he started dating her. Fast forward a few seasons and we catch Leonard rocking out to "I've Got a Feeling" on his way to work.
** In the first two episodes of the series, Sheldon and Leonard talk about "Louis/Louise," the transvestite cop who was the previous occupant of Penny's apartment. Later, during the WholeEpisodeFlashback "The Staircase Implementation" in Season Six, Leonard knocks on the door of that apartment, which is opened by Louis--who's wearing a full evening gown and diamond earrings.
** Way back in season 1, Dennis Kim tells Sheldon string theory is a dead and he'll see it one day. Well...
* CallingYourBathroomBreaks: Sheldon actually insists on a bathroom schedule, occasionally attempting to discuss it with others. Leonard's mother, likewise, stands and says "I have to urinate," before going to the bathroom.
* TheCameo: In the episode where Raj gets in ''People'' Magazine's "Top 30 under 30", he brags about it to some guy sitting nearby. This turns out to be Charlie from ''Series/TwoAndAHalfMen'', who tells him to call when he's on the cover. (This is a direct reference to the fact that Creator/CharlieSheen has indeed been on the cover of ''People'' many, ''many'' times.)
** In Season 3, LewisBlack plays an entomologist who settles a dispute between Sheldon and Howard.
** Quite a few famous scientists and other nerd-based celebrities have popped up playing themselves. StephenHawking, Brian Greene, George Smoot, and NeilDegrasseTyson on the science side. Creator/SummerGlau, Creator/StanLee, Creator/GeorgeTakei, Creator/KateeSackhoff (twice), Brent Spiner, [=LeVar=] Burton (twice), and Creator/LeonardNimoy on the nerd side.
* CampStraight: Apparently, the reason why many people (including his parents) think that Raj is gay, much to his chagrin;
--> '''Raj''': Wait, you don't want to put a bite of that in your mouth without trying my homemade Chantilly cream!
--> {{Beat}}
--> '''Raj''': Yeah, okay, ''that'' time I heard it!
* CantHoldHisLiquor:
** Sheldon. [[spoiler:It helps him get over his stage fright, but boy, does it send him off the deep end.]] In a later episode, he uses tequila as an impromptu mouthwash and admitted he might have swallowed a teeny bit. He immediately follows by an offhand "I love you so much" to Leonard. Even coffee to keep him awake makes him quite hyperactive.
*** Likewise, [[DistaffCounterpart Amy]]. [[spoiler:It not only renders her incapable of multiplying 14x16 and causes massive vomiting followed by passing out, but she also flirts with and ''kisses'' Sheldon.]]
---->'''Sheldon:''' [[DullSurprise Fascinating]].
** In an interesting case of RealityEnsues, Raj finds that he can't talk to woman without a little bit of a buzz (it has sometimes just required one sip or at least the PlaceboEffect). Initially, while capable of talking to women he also very quickly became drunk and obnoxious. As he continued, his ability to hold his liquor improves drastically, and that trailed into his success with women.
* CaptainObvious: Sheldon. An example in "The Financial Permeability", when Penny tells him that she's behind on her bills:
--> '''Sheldon:''' It occurs to me you could solve all your problems by obtaining more money.
--> '''Penny:''' [[DeadpanSnarker ...Yes, it occurs to me, too.]]
** When Leonard's car gets stolen in "The Bakersfield Expedition":
---> '''Sheldon:''' STEALING IS AGAINST THE LAW!
* CaretakerReversal: In Season 1, Sheldon gets sick and makes Penny take care of him. In Season 3, Penny gets injured and makes Sheldon take her to the hospital and take care of her afterwards. What connects these two instances most solidly is the song "Soft Kitty." Sheldon teaches the song to Penny to sing to him ('cause that's what his mother did when he was sick as a youngster). Then, when Penny is injured, she makes him sing it to her.
--> '''Penny:''' Sing "Soft Kitty" to me.
--> '''Sheldon:''' "Soft Kitty" is for when you're sick. You're not sick.
-->'''Penny:''' Injured and drugged is a kind of sick.
* CasanovaWannabe:
** Howard.
** Also, Raj when he's drunk -- although at those times he often also has at least a touch of TheCasanova, DependingOnTheWriter... or the type of intoxication.
* TheCastShowoff: Leonard has been shown playing the cello, Howard and Sheldon both play the piano. And they sing!
** Amy plays the harp and sings as well.
** Penny once gave Sheldon a drink that he didn't know was alcoholic, to give Jim Parsons an excuse to play the piano and sing in the Cheesecake Factory.
** "The Love Spell Potential" features Howard as the DM for a Dungeons & Dragons game, and lets Simon Hedberg show off excellent impressions of Nicolas Cage, Al Pacino, and Christopher Walken, along with other hilarious voices and sound effects (much to Sheldon's delight).
* CastingGag: The actors who play Leonard and Leslie previously played David and Darlene on ''Series/{{Roseanne}}''. Sheldon's mother is played by Laurie Metcalf, also from ''Roseanne''. Christine Baranski co-starred in ''Cybill'', also written/produced by Chuck Lorre (who was writer/producer for ''Roseanne'').
* CatchPhrase: Sheldon created his own with "Bazinga!" whenever he attempts a joke or prank. Unusually, it is only used a handful of times a season.
** A species of bee has been named "Euglossa bazinga".
** Also, "Excuse Me" when Sheldon has to interject with someone's statement
** "Rats!" and "Drat!" when Sheldon is unsuccessful at something.
** "Here we go...." whenever someone causes Sheldon to go into an explanation he has apparently said previously numerous times. Usually said by Leonard.
** "I'm not crazy. My mother had me tested."
* {{Catfight}}: Occurs when Penny and new neighbor Alicia's rivalry over her leading Raj, Leonard, and Howard on culminates in a "What're you gonna do about it, [[ThisIsForEmphasisBitch bitch]]?"
** Somewhat lampshaded by Wolowitz:
--->'''Howard''': Oh, my God... GIRLFIGHT! [''pins Leonard's arms behind his back'']\\
'''Leonard''': What're you doing?\\
'''Howard''': I know you, you're stupid enough to break it up!
** Almost reached that point with an argument between Amy and Bernadette that spilled over from an argument between Sheldon and Howard. The only thing that prevented it was the first swing hitting [[TheHeart Penny]] in the face.
* CavemenVsAstronautsDebate: Often done with the guys getting into massive arguments over geek items or general discussions like whether mummies and zombies are basically the same thing. Although it gets epic when the girls try experimenting with reading ''ComicBook/TheMightyThor'' and found it to be stupid, but ended up getting into a complicated and intense debate over the mechanics of lifting Mjölnir.
-->'''Penny:''' If Franchise/HarryPotter's wand can make decisions why not Thor's hammer?\\
'''Amy:''' If you are going to start comparing wands and hammers... I cannot take you seriously!
* CelibateEccentricGenius: Dr. Sheldon Cooper before Amy Farrah Fowler came along. Even his dynamic with Amy isn't particularly conventionally romantic.
** In the backstory, Leonard's parents only had sex in order to procreate. Once that was done, they were done.
* CelebrityParadox: The geeks have a discussion about both Danica [=McKellar=] and Mayim Bialik in one first season episode. It would've been weird enough if just the former had played a bit part later in the series, but when the latter plays Sheldon's ''date'' and eventually gets a starring role, this gets a bit weird''er''...
** Creator/WilWheaton wears a t-shirt of "''WebVideo/TheGuild''", which Simon Helberg (Howard) once appeared in as the "Kevinator".
** Raj's dad is played by Brian George, the same actor who plays Julian Bashir's father in ''Series/StarTrekDeepSpaceNine'', but none of the guys (who are all avid ''Star Trek'' fans) have noticed.
** In the first season, they group mention their love of the show ''{{Scrubs}}''. Raj later has a brief, and doomed, relationship with Lucy, who is played by Kate Micucci, who was Stephanie Gooch on Scrubs.
* CharacterDevelopment: At the beginning, Penny was a girl who wouldn't ever date someone like Leonard and Leonard wasn't a guy who understood what a relationship with a "normal" girl really meant. They both had to change a lot before they could realistically become a couple. [[spoiler: Penny later mentioned that being with Leonard spoiled her ability to date dumb guys.]]
** When Howard started dating Bernadette, he grew out of his CasanovaWannabe tendencies and learned to be in a real relationship (it's implied that he never had a third date with the same woman before). This culminates in him being the first member of the group to get married. Howard's sincere and heartfelt apology to Bernadette after she learns how he used to be, admitting that he's no longer that creepy loner since he met her and that she's the reason why he's become a ''better'' man. This actually ends up reducing ''Penny'' to tears at how far he's come since they first met.
** Raj has come to master the art of drinking to talk to women, but not so much to become an obnoxious slob. In the Season 6 finale, he talked to Penny while completely sober.
** Sheldon, despite all of his eccentricities and very regimented lifestyle, has come to appreciate social interaction much more. Throughout the first three seasons he often complained about Penny hanging around them since she didn't have much, if any, of the same interests. After a scare that she might stop hanging out with them late in the third season, he admitted that he had come to enjoy her presence. In Season 5, he also began pushing against the boundaries of his regimented life more often and admitted that his life didn't fall apart as a result.
*** Sheldon's social development is best represented in the different explanations for why he likes his specific spot on the couch. Initially, he likes the spot because it maintains a good temperature at all times of the year and because it faces the TV directly to discourage social interaction. Later, when Penny explains to an outsider why Sheldon likes the spot, she includes the comments about the temperature, but alters the remainder to indicate that the spot faces the TV at an indirect angle such that he can watch TV without distortion AND still talk to others. Sheldon fully agrees with Penny's assessment, which says volumes about his CharacterDevelopment.
** Amy started off in the series as a straight DistaffCounterpart to Sheldon, having no sexual impulses, is condescending to others, and even speaking in a similar manner with a dry wit. She started to show an interest in social activities with Penny and Bernadette and now considers Penny to be her "bestie" (best friend). By the beginning of the fifth season, she still has a little of the Sheldon-esque weirdness about her, but is otherwise a very social and friendly individual who knows how to have fun. [[spoiler: By Season 5 Episode 10 ("The Flaming Spittoon Acquisition"), Sheldon and Amy became an official couple... complete with documentation, i.e. The Relationship Agreement]]
* CharacterizationMarchesOn:
** In the first episode Sheldon was basically just Leonard's even more geeky roommate with a dry sense of humor, although he still largely had the same quirks and qualities that have come to define him. The first episode has the "his spot on the couch" gag and he criticized Leonard's board of equations. But he seemed to be more socially astute (recognizing Leonard's crush on Penny and his chances with her) and not completely asexual (he appreciated the attention Penny gave him and was described as a "semi-pro" when at a sperm bank). It wasn't until the second episode that his arrogance and social ineptitude took hold (where Leonard had to make a "[[SarcasmMode sarcasm]]" sign for him). Not to mention, in one of the first episodes he's made to throw his dinner in the trash and proceeds to pick it back out moments later to eat as nothing happened. Compare this to his later self who won't even touch a used napkin or share a drinking glass without thinking he's doomed.
** Similarly, Penny was a lot dumber initially (for example, claiming her screenplay isn't based on her life because she's from Omaha, not Lincoln). She quickly moved from TheDitz to CloserToEarth.
** Bernadette originally was unable to understand jokes and sometimes even sarcasm, though this might be a bit of CharacterDevelopment as she gradually started explaining when something was a joke. It's later implied she was simply ObfuscatingStupidity.
** Stuart (the owner of the comic book store) started out ''less'' nerdy than his current self. He easily conversed with Penny, entertained her and managed to get a date with her, and they continued to date in which they had apparently gone so far as to make out and nearly sleep together. Later on however he's become much like Raj in that he can barely talk to an attractive girl without being rendered speechless or freak out, and in general became alot more awkward and shy.
* ChekhovsGag: The ObjectCeilingCling in "The Classified Materials Turbulence"
* ChewbaccaDefense: Sheldon frequently employs this. See main entry for examples.
* TheChick:
** In most episodes, Penny is the token female, and as often as not, she acts the part. (Occasionally subverted, as when she kills cockroaches for the guys. In such situations, one or more of the guys will take on the role of TheChick.)
** Raj often takes the role of TheChick, being the most emotionally sensitive one of the entire group.
** [[CaptainObvious Although she's a chick]], Leslie Winkle is almost never TheChick. Whenever she makes an appearance, at least one of the guys turns into TheChick. She lampshades this when attempting a relationship with Leonard, "I believe you should take on the male role."
* CloserToEarth:
** Almost any of the female characters who appear on the show, but Penny most of all.
** Also, Leonard compared with the other guys.
** Most female characters are CloserToEarth than the four guys. Leslie Winkle, however, is more on a par with Wolowitz, Koothrappali and all the other 'average' nerds. Which makes her CloserToEarth than Sheldon, but much further from Earth than Leonard.
** And then there's Amy, who is about as far out as Sheldon.
* ClosetGeek: Penny increasingly becomes this as the series progresses. For example, Penny saw the new ''Film/StarTrek'' movie alone and of her own accord while the guys were away in the Arctic.
** A late Season 6 episode has Leonard introduce her to ''Series/BuffyTheVampireSlayer''. She seems to enjoy it but Leonard is disappointed that she's not obsessed with it like he thought she would be, which suggests that Penny definitely shares some interests with the guys although she's not even close to being as passionate about them as they are.
** Sheldon introduces Penny to MMO gaming, and Penny quickly becomes more addicted than any of the guys are. Penny also turns to Sheldon to teach her at least basic physics so she can understand Leonard better.
* {{Cloudcuckoolander}}: Raj is a bit like this, and the trait seems to be more prominent in more recent episodes.
** Sheldon is basically on another planet as far as social norms are concerned.
** It's revealed in "The Werewolf Transformation" that Sheldon believes that Barbers keep "Haircut records".
* TheCloudcuckoolanderWasRight: In the episode where the university has asked the male characters to come up with ideas on how to improve recruitment of women to graduate-level science and engineering programs, Sheldon of all people has arguably the best approach: start the process early, with middle-school girls (so that they'll gain the right preparation in high school to pursue undergraduate science degrees and therefore be in position to enter graduate science programs). When Leonard, Howard, and Raj make a mess of the project by alienating the class they're speaking to, Sheldon rescues things by bringing Amy and Bernardette in via speakerphone to address the class as female role models in the sciences.
* CluelessChickMagnet: Sheldon has gained not one but ''two'' devoted groupies. As well, he ignores a girl who actually ''[[ReadyForLovemaking goes into his room and sits on his bed]]'', and [[MistakenForGay unwittingly manages to pick up a gay man.]]
** After Sheldon ends up charming Raj's date (a successful dentist) causing her to leave for the date with him instead, he then completely fails to understand ''why'' he would see her again? He already has ''[[ComicallyMissingThePoint a dentist!]]''
* TheCobblersChildrenHaveNoShoes: Leonard's mother Beverley is a professional psychiatrist, but she has a very distant and unemotional relationship with her own children, having apparently treated them more like long-term test subjects than a family.
* ColdOpen: Every episode, although some use the rotating electron diagram and whoosh noise before starting.
* ComedicSociopathy: Exhibited by various characters at one point or another.
** Howard and Raj at one point hijack ''N.O.R.A.D'' in order to spy on the ''Series/AmericasNextTopModel'' girls.
*** Howard ''driving the Mars Rover into a ditch'' in an attempt to impress his date.
** Some of Howard's anecdotes include this trope. For example, he was once ''maced'' by one of his "seductees". Whilst it is possible that the girl in question was overreacting (she probably ''has'' to be to keep Howard on the sunny side of the Moral Event Horizon), Howard must have been doing something very wrong for that to happen in the first place.
** After [[ElmuhFuddSyndwome Bawwy Kwipke]] [[spoiler: humiliates him on national radio]], Sheldon's first thought is to murder him. Although he only briefly discusses it with the others (he notes that there are several neurotoxins that would "leave no trace") before being talked out of it, the speed at which his mind works would suggest that he had actually advanced quite far in his mental planning.
** Sheldon at one point seriously suggests using negative reinforcement, specifically electric shocks, to change the register of Penny's voice. Don't annoy Sheldon or he'll [[DisproportionateRetribution torture you into better behavior.]]
** If one subscribes to the theory that Sheldon is on the autistic spectrum, Penny's systematic disruption of his carefully ordered life during their EscalatingWar falls firmly into this trope.
* ComicallyMissingThePoint: In an episode, where Penny dates Leonard's colleague, David Underhill, and he is jealous:
-->'''Leonard:''' You said that you didn't want to go out with me because I was too smart for you! Well, news flash, lady, David Underhill is ten times smarter than me!\\
'''Penny:''' Dave is not smarter than you. He's an idiot.\\
'''Leonard:''' Really? Why would you say that?\\
'''Penny:''' Because a smart guy takes the nude photos of his wife off his cell phone before he tries to take nude photos of his girlfriend.\\
'''Leonard:''' You let him take nude photos of you?\\
'''Penny:''' That's what you took from that?!
** From Penny's POV Leonard is missing her point, but since Leonard is jealous, he's got plenty of reason to focus on Penny's willingness to be photographed naked once he hears about it, rather than on David's stupidity.
*** One of Sheldon's ongoing gags is that despite his genius I.Q., he is completely clueless about being social, leading to many missed points.
-->'''Leonard:''' You convinced me. Maybe tonight we should sneak in and shampoo her carpet.
-->'''Sheldon:''' You don't think that crosses the line?
-->'''Leonard:''' Yes... For God's sake, Sheldon, do I have to hold up a sarcasm sign every time I open my mouth?
-->'''Sheldon:''' You have a sarcasm sign?
** On his first date with Emily, a deaf acquaintance of Penny's, Raj is trying to think of things to say, and Howard is translating for him.
-->'''Raj''': I love music. Do you love music?
-->'''Howard''': You really wanna ask her that?
-->'''Raj''': Oh, you're right. Everyone loves music.
** Sheldon with most social interaction, but a notable example that doesn't quite fit into that category:
---> '''Sheldon's Date''': So, ''Literature/{{Flatland}}'' is not only a mathematical essay, but also a treatise on the social mores of [[VictorianBritain Victorian England]].\\
'''Sheldon''': You know, I never considered that! That is going to completely change [[HappyPlace my visits there]].
** A hurricane of them in "The Plimpton Situation", when Leonard tries to hint to Howard and Raj that he was up all night with the titular scientist.
** Sheldon considers ''Film/ABeautifulMind'' to be a "wonderful romp" of a movie. One can infer that because John Forbes Nash won the Nobel Prize and revolutionized game theory, Sheldon has utterly overlooked the fact that the film is actually about Nash's struggle with a severe mental illness.
** From "The Large Hadron Collision", in re Leonard choosing to take Penny to Switzerland on Valentine's Day to see the [=CERN=] [=supercollider=] instead of Sheldon.
-->'''SHELDON''': "What? That's absurd. Penny has no interest in subatomic particle research."
-->'''LEONARD''': "Yes, but it'll be Valentine’s Day. We can go sightseeing and skiing and make love in front of a roaring fire in the shadow of the snowcapped Alps."
-->'''SHELDON''': "But Penny has no interest in subatomic particle research."
* ComicallySmallBribe:
--> '''Sheldon:''' I brought you some gummy bears.\\
'''Penny:''' (confused) ...thanks?\\
'''Sheldon:''' Now that you are in my debt, could you...
** See also Sheldon's attempt to entice Raj and Howard away from Leonard's app design project by offering them a bunch of cheap crap he'd clearly just picked up at the university's bookstore.
* CommitmentIssues:
** Penny has this problem in regards to her relationship with Leonard. The couple eventually works through it by Leonard putting the power to propose marriage in Penny's hands, so she won't have the weight of it on her shoulders until she decides she's ready.
** Sheldon struggles with committing to Amy and then from there moving forward in their relationship. In his case, the issue stems from having previously thought of himself as a CelibateEccentricGenius who is above time wasting romantic notions, and having an aversion to change. In one episode both Leonard and Amy decide to move too fast for their partners and put moving in on the table. Sheldon and Penny are forced to confide their hesitations about it to each other.
* ContinuityNod:
** Sheldon's explanation for "his spot" on the couch used in the pilot is repeated at several other times, once ''verbatim'' by Penny when Bernadette first joins the group. In the {{flashback}} in late Season 3, Sheldon's explanation for his original spot, using a lawn chair, was identical ''except'' that it ''discouraged'' communication in a group, reflecting how far he had come socially.
** Other nods are used as brief moments, one in particular being when Howard crashed the Mars Rover [[spoiler: and Sheldon confessing the act being the reason Howard loses security clearance on a new project.]]
** One episode involves Sheldon going to court due to his bad driving when helping Penny in "The Adhesive Duck Deficiency".
** The first episode mentions Joyce Kim and the transvestite neighbor, who both show up in the flashback episode.
** The episode "The Hawking Excitation" mentions Sheldon's restraining orders from Leonard Nimoy and Stan Lee.
** After buying a replica of ''[[Series/GameOfThrones Longclaw]]'' in "The Russian Rocket Reaction" it's shown from thereafter to be hung up on the wall of the apartment.
** The Convention Conundrum Sheldon Mentions he can't legally contact Leonard Nimoy Stan Lee and Bill Nye. This is due to the above mention restraining orders including the most recent one filed by Bill Nye.
*** Amy is seen in this episode, wearing the tiara that Sheldon gave her as an apology.
* ContraltoOfDanger: Bernadette usually has an adorably squeaky voice... until she gets pissed off. Then her voice drops low and the other characters know she means business.
* ConversationalTroping: Generally on sci-fi and comic book conventions, including things like a FiveManBand.
* CoolBigSis: Penny ends up being like this to the others, (despite being younger) a normal person who helps them with fashion and relationship issues, lampshaded with a discussion with Sheldon where this is played more literally when she talks him into letting her cut his hair.
* CoolLoser: Thoroughly averted. They have their own tight group of friends they all have quirky mannerisms that would likely make them a bullying target, especially [[InsufferableGenius Sheldon]]. Leonard is the most normal and friendly of the group but especially in the early seasons he has a almost painfully timid disposition. This is a stark contrast to other stories that either have "charmingly geeky" main characters or the "awkwardly geeky" characters as only secondary characters.
* CostumeTestMontage: Penny takes Sheldon to get a new suit that should give him confidence for his awards banquet.
--> '''Sheldon''': ''(wearing an all-white, long tailed, frilly collared tuxedo) [when Penny says "no"]'' Okay, but anything I put on now is only going to suffer in comparison. ''[next shot of Sheldon wearing a classy, sharp black-on-black suit]'' This is absurd, I look like a clown.
* CoordinatedClothes:
** One episode features the gang dressed up as superheroes from the ''JusticeLeagueOfAmerica'' for a New Year's Eve party in a comic book store. Too bad there were [[DressesTheSame several gangs with the same idea]], but Leonard and co's costumes were the coolest and they won the competition.
*** It also helped that they had [[spoiler: an actual woman as Wonder Woman, and a guy "that actually has muscles" as Superman.]]
** "The Holographic Excitation": The newly weds Howard and Bernadette are both small people (as in short and thin), so they dressed as a couple of cute [[Franchise/TheSmurfs smurfs]] for a Halloween party.
** "The Holographic Excitation": Amy and Sheldon are going to a Halloween party and she tries to convince him to wear couple costumes. Amy wants something romantic that shows everyone that they together, while Sheldon doesn't understand the sentiment and would prefer ''Franchise/StarWars'' characters [=R2D2=] and [=C3PO=], or Hewlett and Packard, founders of the HP company. Their compromise is being dressed as Literature/RaggedyAnn and "Raggedy" [=C3PO=].
* {{Cosplay}}:
** In one episode they ''all'' dress like The Flash for Penny's Halloween episode.
---> Raj: "What if we all stood in different positions and ''looked'' like one guy running really fast?"
** The episode "The Barkersfield expedition" opens with Sheldon steaming his [[StarTrekTheNextGeneration Data]] cosplay and Leonard having to borrow make-up from his girlfriend for his. The A plot of the episode actually revolves around the guys getting stranded in the desert after pulling over on the way to [=ComicCon=] to do a full cosplay photo shoot. Leonard was dressed as Captain Picard, Raj as Worf and Howard as a Borg. They looked awesome.
** In one episode, the girls decide to go to Disneyland and they buy DisneyPrincess line-up with costume, make-up, hairdo... The only problem was that they all wanted to be Cinderella. Bernadette claimed it was her idea and that she was the driver, so she won. Penny was Aurora and Amy Snow White. Howard and Leonard really fancied their wife and girlfriend in their outfits.
* TheCouch: Leonard and Sheldon's couch in their apartment.
* CowTools: You could spend forever looking at Leonard and Sheldon's apartment and the comic book store and see all sorts of geeky collectibles. You can also make out computer manuals and software cases in their bookshelves. One especially interesting device is an antique fuse holder hanging by the back hallway.
* [[CrazyCatLady Crazy Cat Man]]: Briefly. After a falling out with Amy in which he terminated his relationship with her, Sheldon buys 25 cats.
* CrazyPrepared:
-->'''Sheldon:''' In here, you’ll find emergency provisions. An eight-day supply of food and water, a crossbow, [[ArsonMurderAndJaywalking Season 2 of ''Star Trek: The Original Series'' on a high-density flash drive]].
-->'''Sheldon:''' I have a pre-packed emergency 48 hour survival kit recommended by the Department of Homeland Security... [[Series/TheSarahConnorChronicles and Sarah Connor]].
** Sheldon also stages Emergency Disaster Drills every three months for every possible event from floods and earthquakes to Canada invading California.
** In anticipation for a Scavenger Hunt / Treasure Hunt in "The Scavenger Vortex," Sheldon brings his bowling ball along on the offhand chance the clues lead them to a bowling alley (being germophobic and hating using rented balls). The bowling ball in his backpack slowing him down is [[ChekhovsGun brought up]] several times, but he was correct in that one clue was at a bowling alley. Brandishing his ball in the car, he exclaims "My brain is better than EVERYONE'S!"
* CreatureOfHabit: Sheldon, to the point where he views the most minor of changes in his life as TheEndOfTheWorldAsWeKnowIt.
* CreditsGag / FreezeFrameBonus: The Chuck Lorre Productions logo and ensuing paragraph at the end of every show. Sometimes manages to get away with things the show probably wouldn't by virtue of the fact that nobody sees them on TV anyway. A complete list of them can be found [[http://www.chucklorre.com/index.php here]].
** For example, the one at the end of the ''Age of Conan'' episode details Lorre's recent trip to Vegas and his imagining of a man going home and "blowing his brains out" after reflecting on his unsatisfying job.
** Sometimes CBS' radar ''still'' manages to catch them, and they're blanked out when they actually air (but not on Lorre's web site).
** FreezeFrameBonus also applies to the opening credits. Among other things, there is a TTC subway train, a 3-1/2" floppy disk, a disco ball, and a Hollywood Ave. street sign.
* CringeComedy: Howard hitting on Creator/SummerGlau in the most obnoxious and creepy way possible. Poor girl.
%%
%% the 'Crowning' stuff goes on the crowning pages, not here. Links to said pages can be found on the YMMV tab.
%%
* CulturalRebel: Rajesh is not too fond of Indian food, while Howard takes a perverse thrill from not keeping kosher.
** Raj also can't seem to stand the idea of going home.
---> "I don't want to go back to India! It's hot, and it's loud, and there are so many people. You have no idea, they're ''everywhere''!"
** Raj and Howard go back and forth on their respective cultures, as noted by Penny when predicting the guys' orders at The Cheesecake Factory in "The Panty Pinata Polarization"
---> "Shrimp Caesar salad with no almonds for the highly allergic kosher-only-on-the-high-holidays Howard, and for our suddenly-back-on-the-Hindu-wagon Raj, meatlover’s pizza, no meat."
** Sheldon is also one regarding his mother's religious lifestyle. He resents that he was forced to go through Cotillion, pointing out the lack of application that having all the social graces to be able to function in ''18th Century Vienna'' presents.
** Sheldon also affects an more upper-class accent, only slipping into his native Texan drawl when flabbergasted, irritated or angry.
* TheCSIEffect: Invoked; Sheldon expects too much of the police.
* CuteBruiser: You don't wanna wind up in a situation where Penny's fist meets your face.
** Also Bernadette studies Krav Maga.
* CuteButCacophonic: Bernadette, oh God, Bernadette.
* CuteKitten: Sheldon's favorite childhood lullaby "Soft Kitty" proves you don't even need an actual kitten for this trope.
** Sheldon does not, however, enjoy LOLCats; an email of such from Penny gave her her first strike.
** Sheldon's 25 cats. Especially Zazzles, he's so "Zazzy".
* CuteMute: Emily, a deaf girl that Raj dates.
* CuttingTheKnot: Penny has to get Sheldon's Flash drive from inside a puzzle box. Before he gives her the instructions on how to open it over the phone, Penny asks if he has any emotional attachment to the box. When Sheldon answers no, she simply smashes it open.
** In another episode, Howard tries using a robot hand to pleasure himself. After Leonard and Rajesh run out of ideas of what to do, they take Howard to the Emergency Room. There, the Nurse suggests simply restarting the computer attached to the hand, and despite Howards pleas not to do so, she turns it off, and the hand lets go.
--->'''Howard:''' [[ItMakesSenseInContext Winnie the Pooh is out of the honey tree!]]
[[/folder]]


[[folder:D]]
* DarwinistDesire: Sheldon tries to find which of his friends is the best genetic match for his sister, on the hope that the offspring might be a genius like him. When she finds out, she lets her feelings known to Sheldon... by kneeing him in the groin.
* ADateWithRosiePalms:
** In the first scene of the pilot, while Leonard and Sheldon are at a sperm bank to make donations for extra cash:
---> '''Sheldon:''' "I can't do this."
---> '''Leonard:''' "Are you kidding? You're a semi-pro!"
** Season 4 premiere. [[spoiler:Howard had [[ADateWithRosiePalms A Date with Rosie]] [[InstantAwesomeJustAddMecha The Robotic Palm]] and then it got stuck.]] [[HilarityEnsues Hilarity Ensued]].
** When Leonard wonders how he can date someone who believes in psychics, Howard draws a diagram showing how few women will share his views, like him and be liked by him. When Leonard complains, Howard draws a dot on Leonard's palm.
--->'''Leonard''': What's that?
--->'''Howard''': Your new girlfriend. You two have fun tonight.
** Subverted in “The Love Car Displacement”: We see Raj, alone in his room, cheerfully step out of the bathroom with a box of tissues. He grabs two tissues and gets under the covers, shivers with anticipation and turns on the TV.
--->[[spoiler:'''Announcer''': Next on Turner Classic Movies: ''Literature/BridgetJones’ Diary''.]] \\
[[spoiler:'''Raj''': ''(sniffing)'' Oh God, I’m crying already.]]
** Female example with Amy:
---> '''Amy:''' And if the bar doesn't work out, we can always go to Walgreen's and get you a nice electric toothbrush. I call mine Gerard.
** Leonard muses that it's wonderful his girlfriend is 9000 miles away; he can do anything he wants.
--->'''Howard:''' You mean playing ''D&D'' with us then taking a suspiciously long shower?
** Amy once again in "The Werewolf Transformation", musing on Sheldon growing his hair out.
---> '''Amy''': I think you might look sexy with long hair. Be the kind that flows down to your shoulders and blows back while riding on a horse. Bareback and barechested... I-I'm going to go [[INeedToGoIronMyDog brush]] [[BlatantLies my]] [[ContinuityNod teeth]], it might take a while.
* DeadpanSnarker:
** Leslie Winkle.
** Howard also took on this attribute more in later seasons.
** The entire cast takes turns with this.
** This is basically all Leonard does now since he got with Penny.
** Just about ''anybody'' who has to deal with Sheldon becomes this at some point.
** Sheldon was supposed to be this for Leonard in the pilot, but became a BreakoutCharacter and was delegated to ButtMonkey instead. He still has moments of this despite not being able to understand sarcasm.
** Penny, as she gradually became the NerdNanny.
* DeathGlare: Penny has one for Sheldon almost OnceAnEpisode, though he rarely notices.
** Penny did this to Raj in "The Skank Reflex Analysis."
** Bernadette took this trope UpToEleven in the same episode.
* DeathRay: Sheldon's mother or Sheldon has mentioned that Sheldon tried to build one as a kid but failed and thus they kept teasing him.
** Pissed the dog off something terrible though.
*** Sheldon ended up building a 'death ray' to scare off a bird that tormented him. As it was dubbed this by Howard, Sheldon corrects him, and then goes on to say that if he DID have a death ray, he'd be in his lair enjoying the money the world gave him for not using it.
* DeceptivelyHumanRobots: Parodied as most of the characters joke that ''Sheldon'' is secretly a robot.
--> '''Leonard''': Sometimes your movements are so lifelike, I forget you're not a real boy.
* DefconFive: Leonard falls victim to this trope and is then lectured by Sheldon.
* DefenestrateAndBerate: When Penny finds out that her boyfriend writes a blog about their sex life, she violently breaks up with him. She storms to the guys' apartment, opens the window and throws out her soon-to-be ex's iPod and calls him a jerk.
* DelayedReaction: [[spoiler: When Penny says "I love you" to Leonard, it takes him, her, and the STUDIO AUDIENCE a second to react to the significance of her saying that.]]
* DepartmentOfRedundancyDepartment: Despite being somewhat of a GrammarNazi, Sheldon himself seems highly prone to describing things this way, with "''Franchise/GreenLantern'' Lantern" and "''[[Literature/TheLordOfTheRings Lord of the Rings]]'' Ring" being two prominent examples. Of course it's actually a subversion.
* DependingOnTheWriter: Sheldon's mechanical aptitude. In some episodes, we see him put together a sonic generator to scare off a bird, or reminisce about building a working CAT scan machine as a child. In others, he literally can't figure out how to open a toolbox without Howard's help.
* DestructoNookie: Leonard once mentions that they ''broke'' Penny's bed.
** Implied when the entire building heard Penny's "[[GoodPeopleHaveGoodSex rodeo]] [[TheImmodestOrgasm thing]]", after she had drunken, meaningless sex with Leonard.
* TheDevTeamThinksOfEverything: When Sheldon's trying to learn to drive, the simulator he uses ends up allowing him to drive onto the second floor of a mall and then, with accurate whimpering, destroy a pet store.
--> '''Sheldon''': Remind me to compliment Wolowitz on the software. It's amazingly detailed.
* DevelopmentGag: In the Season 3, special features the cast does a fortune cookie Q&A about their lives and favorite moments on the show, which looks to be ad libbed. Simon (Howard) makes a joke while reading a fortune cookie "Help, I'm trapped in a fortune cookie factory!" This same joke is referenced in the fourth season as a joke that Howard is always saying and trying to get a laugh from people.
%%Did Not Do The Research is not a trope and not to be used as a trope. If you have a blunder you MUST report, find one of the trope on the index and put it in Trivia.%%
* DisabledLoveInterest: The girl that Penny finds for Raj is deaf. So he can talk around her.
* DisappearedDad: Howard's father left when he was 11.
* DisapprovingLook:
** Sheldon is often on the receiving end of these Looks, mostly from his roommate Leonard or Penny.
** Amy got four Disapproving Looks ''simultaneously'' from Leonard, Penny, Raj, and Sheldon when they were all administering Bernadette and Howard's wedding together, and Amy said that she would be happy to be Bernadette's maid of honour again should their marriage fall apart.
* DisasterDominoes: Leonard gets new contacts and walks into a crowded cafeteria. HilarityEnsues.
* DisposableSexWorker: A neighbour acted as one in ''Series/{{CSI}}''.
* DisproportionateRetribution: Penny touched Sheldon's food while having her own full plate of food and nearly ate his because she was hungry. She then sat in his spot to take a stand. He responded by banishing her from his and Leonard's apartment. Her response was to not serve him at the cheesecake factory, and then imply that she messed with his food. His response was to take away her wifi. When she ruined laundry night for him, Sheldon went too far and flung all of her laundry, including her underwear, outside on telephone poles. All of this escalating war stems from Sheldon's deranged responses to small mistakes from Penny.
* DiscriminateAndSwitch: Creator/StanLee didn't put 'my friend' and 'Excelsior' when he gave Raj an autograph, and it would seem racist until Howard pointed out that that wouldn't be the case if Raj didn't bug him about his characters and their {{Alliterative Name}}s.
* DistaffCounterpart: Amy to Sheldon, for sheer longevity. Leonard's mom Beverly also possesses similar quirks, such as having a very particular way of having her tea.
** Lucy to Raj? Or is she more of a female Stuart?
* DistractedByTheSexy: Whenever a new pretty girl shows up. [[{{Asexuality}} Sheldon]] is immune, and, [[DependingOnTheWriter on occasion]], so is [[DoggedNiceGuy Leonard]]. Howard is ''always'' the first to lose focus. In fact, one time just hearing that Penny's visiting "friend" from Nebraska was [[ReallyGetsAround easy]] meant that between shots, Howard somehow managed to literally ''[[StealthHiBye disappear]]'' from the room!
** Subverted when they are focused on something else and the Sexy is verbal. Once, Penny and three friends stop by while they are playing ''VideoGame/{{Halo}}'' and ask if they want to have an orgy. After no response, Penny tells her friends "I told you so," and they leave. Shortly after, Leonard pauses the game and says he thought he heard something, but he shrugs it off. On another occasion the four guys are trying to come up with a better way to set up her entertainment system than the way suggested in the instructions and Penny attempts to get their attention by announcing that she was going to take all her clothes off, to no response.
** Once when Penny described a falling out with a recently acquired boyfriend.
--->'''Penny:''' A smart guy takes the nude photos of his wife off his cell phone ''before'' he tries to take nude photos of his girlfriend.\\
'''Leonard:''' [[ComicallyMissingThePoint He tried to take nude photos of you?]]\\
'''Penny:''' That's what you took from that?! ...The guy is married!\\
'''Leonard:''' Oh yeah. I'm uh... oh, [[AndThatsTerrible that's terrible!]]
** Amy and Sheldon tried to do a social experiment to see which bits of juicy gossip would be passed quicker around their circle of friends. Being that they have little [[NoSocialSkills social skills]], it was pretty obvious from the get-go their choice of subjects would render the experiment almost irrelevant.
---> '''Amy:''' ''(all in one breath)'' "Sheldon and I engaged in sexual intercourse. In other news, I'm thinking of starting an herb garden. Mum's the word. Gotta go."
** Howard had admitted he really stops listening to Bernadette when she undressed, focusing more on her body than what she is saying.
* TheDitz:
** Many of the female characters. Penny on occasion, especially in the first few episodes.
** Penny's boyfriend, later ex-boyfriend Zack is shown to be stupid and his thought processes are very slow.
* DoesNotLikeShoes: In general, Penny, except for flip-flops. A point is often made about [[AllWomenLoveShoes how many shoes she buys]], yet she never actually seems to wear them.
* DoesThisRemindYouOfAnything:
** When Leonard and Penny are together several episodes deal with them as if they were a married couple with Sheldon as their child. It is heart-breaking.
** In reference to the ordeal of becoming Sheldon's roommate in "The Staircase Implementation":
---> After you pass the first three barriers, you kind of want to take it all the way.
** Leslie and Sheldon's argument about their respective theories in "The Codpiece Topology" was amusingly comparable to an argument over religious beliefs.
---> '''Leslie:''' I can't be with someone who believes in string theory! How would we raise our children?
---> '''Leonard:''' I figured we'd teach them both theories and let them decide for themselves.
* DoggedNiceGuy: Leonard. Less so during Season 3, but then he's finally with Penny.
* DontExplainTheJoke: Yet another social convention Sheldon doesn't understand.
--> '''Sheldon''': I see, the humor is derived from...
* DoubleStandard: Leonard learns about these the hard way--after [[spoiler:Penny gets drunk and has meaningless sex with him, post-breakup]], Leonard attempts to do the same, once with Leslie and once with Penny. They're not pleased.
-->'''Leonard:''' [[LampshadeHanging I'm starting to sense a]] DoubleStandard [[LampshadeHanging here...]]
* DoubleStandardAbuseFemaleOnMale: Howard's mother bearhugs Raj back to her house to imprison him. This is naturally PlayedForLaughs. If Raj was a woman everyone would have screamed rapist.
* DownOnTheFarm: Penny's from just outside of Omaha.
* DramaQueen: Howard's mother is this. If she's not bugging Howard dramatically, she's getting dramatic about something else.
* DrivesLikeCrazy: Penny does not actually drive badly, she drives like a person who has driven for a very long time and will sometimes bypass 'normal' behavior for a quicker route, such as not slowing down much over speed bumps. Her constant ignoring of the Check Engine light is a running gag, though.
** Sheldon doesn't drive normally; part of the Roommate Agreement was that Leonard would take care of the driving. They eventually forced him to get a learner's permit but he will likely never get his license because even in a simulator he does horribly. In a later episode he had to drive Penny to hospital and while they got there in one piece, it wasn't a relaxing experience.
* DrivingTest: The gang try to teach Sheldon to drive using a computer simulation. He ends up driving through a virtual mall like in ''Film/TheBluesBrothers''.
--> '''Leonard''': Awww no, not the pet store!
--> '''Sheldon''': Remind me to compliment Wolowitz on the software. The detail is remarkable.
* DropInCharacter: Penny embodies this the most, as she has a tendency to stop by the guys' apartment for random reasons like coffee or tech support (Raj and Howard are usually over there for an actual activity like ''Halo'' night). On the other hand, Leonard often visits Penny in ''her'' apartment in not too dissimilar a manner, although often expressly because Penny needs someone to talk to. Penny does this so much that she will casually drop by the apartment in her sleep clothes, much to the displeasure of one of Leonard's girlfriends.
* DroppedAfterThePilot: In the unaired pilot there's a girl named Katie whom Leonard & Sheldon rescue from being homeless and moves in with them, and Gilda, geeky female friend/fellow researcher of theirs with whom Sheldon has had sex.
* DroppedGlasses: and the inevitable BlindWithoutEm, Leonard.
* DumbBlonde: Penny can be flighty at times, but overall she isn't very stupid. The first couple of episodes she was more TheDitz but this was replaced with her generally being more CloserToEarth. However, she is still a bit dumb, frequently thrown by easy to understand incidents (for example a simple, yet not short, sentence where the hardest concept was "joined ownership")
** In one episode Penny takes some physics lessons from Sheldon so she could better understand Leonard and what he does. Although Sheldon is a horrible teacher, she does seem to learn a little, at least enough for a {{Technobabble}} gag.
* DumbIsGood: Averted by the majority of Penny's boyfriends, who are dim and often rather obnoxious. Though played straight for Zach, who ends up befriending the guys and even enjoys their hobbies.
* DungeonmastersGirlfriend: [[SheIsNotMyGirlfriend Not quite a girlfriend]], Penny nevertheless occasionally attempts to get in on the nerd action. [[spoiler: By the third season, she also fits the trope title in its literal sense.]]
* DysfunctionJunction: Played fairly subtly but most of the main characters had difficult or traumatic childhoods.
** Very much TruthInTelevision for many nerds.
[[/folder]]


[[folder:E]]
* EarlyInstallmentWeirdness: Sheldon is a lot more relaxed in the {{pilot}} episode, and while droll he seemed mostly social capable. Compare to the {{flashback}} to when Leonard moved in from Season 3, where Sheldon is much ''more'' socially awkward. He also borderline flirts with her and competes for Penny's attention, two things he completely stops afterwards. He also undermines Leonard about his chances with penny but penny isn't insulted, this reverses as they become friends. And he uses the phrase "have sex" instead of "engage in coitus."
** Many early episodes display Sheldon without traits that later become trademark actions, such as knocking on Penny's door once instead of thrice, and without stopping to say her name.
*** The RuleOfThree that later becomes part of Sheldon's SuperOCD also gets skipped when Sheldon gets the flu and he calls out for Leonard only twice.
** Howard and Raj were more like [[DropInCharacter drop-in characters]] in the earliest episodes.
* EasilyForgiven: Beginning of Season 3. You know the one.
--> '''Sheldon:''' I forgive you, let's go home.
** In "The Justice League Recombination" the guys have to apologize to Zach for making fun of him.
---> '''Sheldon:''' Milk Dud?\\
'''Zach:''' Oh I LOVE Milk Duds! ...okay, we're cool.
* EgocentricTeamNaming: Sheldon tries to get Leonard's app development team to name the app after himself, twice. The first time he uses [[FunWithAcronyms an acronym]] and the second time he spells [[SdrawkcabAlias his name backwards]]. He claims both times it's a "[[BlatantLies happy accident]]".
** In another episode the guys team up to help Sheldon get over his fear of public speaking, comparing themselves to the X-Men. Sheldon thinks that "since I am Sheldon Cooper, you shall be my [[InnocentInnuendo C-Men]]."
* {{Egopolis}}: Sheldon's ''VideoGame/SimCity'' he designed, Sheldonopolis. With architecture including Sheldon Square, Sheldon tower, Sheldon Stadium (home of the Fighting Sheldons), and Shel-Mart.
* EldritchAbomination: Not a straight example, but the painting of Penny and Amy from "The Rothman Disintegration" is hilariously treated as though it ''is'' one, by both Penny and Bernadette.
** There is also Howard's mother who though never clearly seen onscreen is described as an extremely obese, bald(ing) old woman who takes thirty minutes to climb three flights of stairs and needs help putting on dresses as she can't put her front and back in at the same time on her own.
--->'''Howard's mother:''' It's like tryin' to keep two dawgs in a bathtub!
* ElmuhFuddSyndwome: [[RecurringCharacter Wecuwwing Chawactuh]] Bawwy Kwipke.
** Then he gets Siri on his smartphone...
* EmotionalRegression: Many of the characters are still fairly young at heart, so even though they are degree'd professionals they can sometimes act like kids, especially when put into uncomfortable situations. Sheldon is the most notable, being a ManChild on a fairly regular basis, but Leonard always becomes a kid when his mom comes to visit and Howard [[BasementDweller still has a mother/child relationship with his mother]].
* EpicFail: Exhibited by both Sheldon and Barry Kripke in their one-on-one basketball game to decide who gets the corner office in "The Rothman Disintegration." Leonard's comment while watching the "game" says it all:
-->'''Leonard:''' You know all those terrible things bullies used to do to us? I get it.
** Basically how the producers described the first attempt at a pilot. The only thing that worked was Leonard and Sheldon's interaction, as well as Galecki and Parsons chemistry. The proto-Penny, Katie, was ''despised'' by the test audiences, as her relationship with the guys was reversed. Instead of being (generally) a bright ball of sunshine in their lives she was a manipulator and the guys would work to bring her out of her cynical outlook.
* EscalatingWar:
** Between Raj and Sheldon in "The Hot Troll Deviation".
** Between Penny and Sheldon when Penny finally had enough of Sheldon's insistent quirks, but it started largely because Penny got her "third strike" and Sheldon banished her from the apartment. Penny struck back by using up all the washing machines during Sheldon's laundry day, knowing how regimented his schedule is, but Sheldon has no boundaries he isn't willing to step over.
** Between Howard and Sheldon in "The Parking Spot Escalation".
* EvenBadMenLoveTheirMamas: Sheldon's mom is the ''only'' one who can override Sheldon's irrational behavior.
** While Sheldon loves his mom he still dislikes her religious zealot personality and is fine with jokes at her expense. When it comes to his "Memaw" (Grandma) he absolutely ''adores'' her.
** The Department of Homeland Security apparently has a plan in place for when Sheldon goes too far with his abilities. It involves telling his mother on him.
* EvenBeggarsWontChooseIt: When looking through Leonard's wardrobe, Penny picks out several shirts and tells Leonard to throw them away, noting that he shouldn't even give them to charity because: "Seriously, you won't be helping anyone."
* EvenTheSubtitlerIsStumped: Howard is briefly stumped by Raj's DisabledLoveInterest's fast and furious signing.
* EveryoneKnowsMorse: Subverted in the episode "The Cooper-Nowitzki Theorem". Sheldon attempts to use Morse code; however, Leonard claims he doesn't know Morse code and refuses to learn it at three in the morning.
* EstablishingCharacterMoment: The pilot gives a good moment to everyone;
** Leonard's distracted look when seeing Penny in her apartment and subsequently trying to talk to her
** Sheldon being more interested in the {{DVD Commentary}} of ''Series/{{Battlestar Galactica|Reimagined}}'' than talking to their new neighbour
** Howard trying to flaunt his OmniGlot nature to Penny
** Raj when Penny tries talking to him and he just keeps eating his meal as though she didn't say anything
** Penny when she hugs Leonard and Sheldon and offers to buy them dinner
*** From the rest of the Series;
** Leonard's mother and her constant psycho-analysing. Capable of reducing Penny to a flood of tears in the space of ''three'' flights of stairs... ''twice''.
** Amy Farrah Fowler's introduction, leading to a major OhCrap from Howard and Raj for having found Sheldon the ''perfect'' woman;
---> '''Howard''': [[MyGodWhatHaveIDone My god, what have we done?]]
* EmbarrassingTattoo: Penny has one she claims is the Chinese symbol for "Courage". According to Sheldon, it actually means "Soup".
--> '''Sheldon''': But I suppose it does take courage to demonstrate that kind of commitment to soup.
* EstablishingSeriesMoment: The "[[http://www.youtube.com/watch?v=3MACSw5SkF4 Sarcasm Sign]]" of the second episode
* EverythingIsRacist: ...to Rajesh
-->"Did you have to make me sound like a ''[[WesternAnimation/TheSimpsons Simpsons]]'' character!"
** You kind of have to agree with him about the cell phone voice recognition software.
--->'''Leonard:''' Let me try one! Calling Mcflono Mcfloonyloo!
--->'''Cell phone:''' Calling... Rajesh Koothrappali.
--->'''Rajesh:''' Impressive! ...and a little racist.
** After Howard imitates the Bollywood Breakdance routine that Raj performed whilst heavily inebriated the night before:
---> '''Raj''': That's very offensive.
---> '''Howard''': Yeah, we thought so too.
** This even applies when the potential racism isn't aimed at Indians:
--->'''Raj''': Spiders give me the jeebie jeebies.
--->'''Howard''': It’s heebie jeebies.
--->'''Raj''': I know, but that sounds anti-Semitic.
* EverythingsBetterWithMonkeys: Amy is shown owning a cigar-smoking capuchin monkey in the episode ''"The Agreement Dissection"''. Although, to quote her, he's a bit of an ass.
* EverythingsBetterWithPrincesses: When the girls dress as Disney Princesses, they have varying results:
** Bernadette uses her Disney/{{Cinderella}} costume to turn on Howard, and he goes shirtless as he tries to act like a prince on horseback, complete with "My Lady."
** Penny, as Disney/SleepingBeauty aka "Princess Aurora" is an accidental turn-on for Leonard, who sees her and begins taking off his clothes.
** Amy, as [[Disney/SnowWhiteAndTheSevenDwarfs Snow White]], tries unsuccessfully to get Sheldon to give her a wake-up kiss.
* EvilCounterpart: Late in the second season, a new neighbor moved in above Leonard and Sheldon, Alicia. She is pretty, blonde, an actress, and very quickly acquires the attention of the guys, much like when Penny moved in. The main difference is that Alicia was a shameless flirt and manipulated the guys to do everything for her. While Penny did many similar things, she generally treated them with respect and didn't abuse them. Partially out of jealousy and partially out of concern for her boys, Penny eventually [[{{Catfight}} clashes]] with Alicia.
* EvilGenius: Sheldon occasionally invokes this on purpose (see EvilGloating and EvilLaugh below). Leonard has already noted that Sheldon's "one lab accident away from becoming a supervillain".
** Later, when Leonard states that he's worried about Sheldon, Howard says "So am I. I'm worried that one day, he'll set off a low-yield nuclear device because the cafeteria ran out of lime Jell-O."
-->'''Prof Proton''' (to Leonard) "Is he dangerous?"
-->'''Leonard''' "Actually, he's a genius"
-->'''Sheldon''' "I am!"
-->'''Prof Proton''' (to Leonard) "That doesn't answer my question...."
* EvilGloating: "Hello, Kripke. This classic prank has been brought to you by the malevolent mind of Sheldon Cooper."
** "Hello puny insects!"
* EvilLaugh:
** Sheldon has a rather droll example.
** Raj's laugh in "The Bat Jar Conjecture".
--->"That's more like: We're [[Disney/OneHundredAndOneDalmatians tall thin women who want to make a coat out of your Dalmatians]]."
* EvolutionaryLevels: Invoked by Sheldon to explain why he shouldn't have to learn to drive. One of the ''many'' indications that Sheldon isn't the OmnidisciplinaryScientist that he thinks he is.
* EvolvingCredits: As of Season 6, Amy and Bernadette have been added to the open.
* ExpospeakGag: Sheldon's "I'm polymerized tree sap and you're an inorganic adhesive, so whatever verbal projectile you launch in my direction is reflected off of me, returns to its original trajectory and adheres to you." And this is just one of '''many''' instances.
** Sheldon's attempt at 'trash talk': "I am given to understand that you mother is rather overweight. Of course, if this is the result of a glandular problem and not over-eating, I will gladly retract my statement."
** Not to mention this gem from "The Desperation Emanation":
--->'''Leonard''': What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?\\
'''Sheldon''': Screwed.\\
'''Leonard''': There you go.
* {{Expy}}: (In Universe) When The Science Guy meets Professor Proton.
-->'''Bill Nye The Science Guy''': Wow it is indeed an honor to meet you, Mr Jeffries. Without you I wouldn't have had a show.
-->'''Arthur 'Prof. Proton' Jeffries''': Yeah, I know, that's what I told my lawyers!
[[/folder]]
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