History TheBigBangTheory / TropesKToO

* OffTheShelfFX: In "The Cooper/Kripke Inversion", Howard scans Raj for his action figure with an UsefulNotes/XBox360 Kinect sensor.

* OrwellianRetcon: In a later season episode Leonard and Penny discuss their FirstKiss and Penny says it was at [[CallBack Leonard's birthday party in the first season, he points out it was the Halloween party about six months later]] which she claims to not remember. When pressed she admits she does remember it but is embarrassed because she was drunk and dealing with her ex-boyfriend Kurt and doesn't want that baggage included in the memory. Leonard agrees to let the birthday party be their story.

** Raj's one-time girlfriend Lucy in "The Romance Recalibration." She claims that their relationship didn't work out because he kept making her do things that made her uncomfortable. Ignoring the fact that Lucy kept ditching Raj on dates, didn't put any effort into fixing her personal problem, or making the relationship work. And she also forgets that the last time she went running back to him, he was seeing Emily, who was much more socially savvy, better looking, had a more interesting job and was genrally more fun to hang out with.

%% * KissingCousins: Howard and his cousin Jeannie, apparently.

** Bernadette acts as a lonely Russian cosmonaut and sexy cardiologist for Howard, Penny plays a sexy scientist using only a pair of glasses, Howard and Leonerd are very keen on the girls' Disney makeover.

** Sheldon generally wears two t-shirts, the outer shirt usually a superhero symbol like the [[Franchise/TheFlash Flash]] and the under shirt has long sleeves rolled up to his elbows.

** Howard is an ExtravertedNerd and a CasanovaWannabe who thinks he's a catch, but is pretty clueless about sex and women and just comes as a sexist AbhorrentAdmirer to most girls he hits on and a terrible lover if he manages to get them in bed. In "[[Recap/TheBigBangTheoryS2E12TheKillerRobotInstability The Killer Robot Instability]]", Penny gives him a TheReasonYouSuckSpeech and tells him he's likely going to end up dying old and alone thanks to his attitude, which leaves him devastated, but he seems to take it to heart and his sleaze behavior is taken down a notch. Soon after he starts dating NiceGirl Bernadette and overall TookALevelInKindness, and had a mostly stable relationship with her where they have a mostly healthy sex life.

** Leonard is an awkward and insecure HollywoodDateless nerd and his sexual performance seems to change DependingOnTheWriter. During his relationship with Penny, she's commented he's both disappointing ''and'' that he's great. In "[[Recap/TheBigBangTheoryS4E23TheEngagementReaction The Engagement Reaction]]", Penny and Priya talk about how he's like in bed and come to the conclusion that while he tries really hard to please, he doesn't have much talent for it.

* OverprotectiveDad: Intentionally subverted/invoked with Penny's father, who really likes Leonard and considers him far above the dumb, brawny jocks she usually dates. When he discovered they actually didn't [[TheBeard get back together]], [[spoiler: he implies he's going to verbally assault Leonard, only to quietly beg him to not give up on her. He then tries to use reverse psychology on Penny (who was in her bedroom) by yelling at Leonard to never see her again.]]

** In a case of CharacterizationMarchesOn, Sheldon actually becomes ''less'' aware of sexuality and how it works over the course of the show until he begins a physical relationship with Amy. In the first episode, during a visit to a sperm bank, he says he's not sure he can do it, to which Leonard says he's "[[ADateWithRosiePalms practically a master at it]]." Later seasons, however, suggest that Leonard, Penny, and the others had to buy him a book on the mechanics of sex, despite him saying in an earlier episode that he was familiar with the mechanics of the procedure.