History TheBigBangTheory / SeasonOne

* ArtisticLicensePhysics: While Sheldon is ill Leonard tells him to drink plenty of fluids, and Sheldon responds with "What else would I drink? Gases? Solids? Ionised plasma?". This implies that he doesn't think gases and plasma are fluids when in fact they are, because a fluid is defined as something which can flow.

* EscortDistraction: In "The Peanut Reaction", Howard has to take Leonard out so the others can plan a birthday party for him. To do this, Howard fakes an allergic reaction so they have to go to the hospital, and when he can't hold Leonard away any longer, he incurs an actual allergic reaction by eating a candy bar with peanuts.

* PaintballEpisode

* EntitledBastard: This exchange after Leonard and Sheldon's hilarious brawl, following Sheldon crashing Leonard's presentation in ''The Cooper-Hofstadter Polarization''

'''Leonard: You're lucky I didn't run you over!

* MyGodWhatHaveIDone: Combined with WhatTheHellHero in "The Jerusalem Duality". Fed up with Sheldon being even more annoying than usual with Dennis posing a threat to his career by proving all of Sheldon's research are flawed and dead ends, Leonard has given Dennis a very attractive girlfriend who has distracted Dennis from making great achievements in physics. Leonard feels terrible about what he did because now Dennis will become an unemployed young man with no career, no income and a drinking problem.

* LoveAtFirstSight

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of [[GirlsLoveStuffedAnimals Beanie Babies and Hello Kitty item]]s.

** Leonard gives one to Katie in the unaired pilot, explaining that her short commings arn't because of her mother or the ex-boyfriend, but because she makes stupid choices and [[NeverMyFault blames everyone else]] when she doesn't get her way.

!!Tropes in TheBigBangTheory Season One

''TheBigBangTheory''

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of Beanie Babies and Hello Kitty items.
* RecruitedFromTheGutter: In the original pilot Sheldon & Leonard take in a recently homeless woman and decide to reform her. She goes along with it mostly because she has nothing better going on in her life.

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of Beanie Babies and Hello Kitty items.

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of Beanie Babies and Hello, Kitty items.

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of Beanie Babies and Hello, Kitty items.
* SherlockScan: Sheldon deducing with whom Leonard is speaking on phone.

* SherlockScan: Sherlock deducing with whom Leonard is speaking on phone.

* TheReasonYouSuckSpeech: Penny tells Leonard he ought to grow up and stop playing with science fiction toys and action figures. After Leonard takes her words to heart and starts to sell his things, Sheldon later counters with Penny's own collections of Beanie Babies and Hello, Kitty items.

* HellIsThatNoise: Sheldon and Leonard's reaction to Penny's singing in TheLoobenfieldDecay. (possibly HilariousInHindsight when you consider Sheldon ''begging'' Penny to sing when he is sick)

* CharacterizationMarchesOn: Penny is not nearly as flighty and/or ditzy in later episodes as she was in the pilot.

* PolarOppositeTwins: Sheldon and his sister Missy.