* TookALevelInBadass: For a certain qualification of "badass." Leonard started off the series being painfully shy and uncertain of himself, it took him the entirety of the first season to officially ask Penny out. It's implied that interacting with Penny has helped boost his sense of self-worth and he progressed from being a [[NiceGuy nice]], [[TheGenericGuy generic guy]] to becoming one of the more scathing {{Deadpan Snarker}}s and having more of a potential love life than just with Penny. Just with his interactions with Penny he is much more comfortable being assertive and teasing her than he was before, no longer feeling he has to be submissive to stay on her good side.
** In parallel CharacterDevelopment, we've also seen Penny Take A Level In Nerd. (The first one is [[http://www.youtube.com/watch?v=vKXBqs1flqQ wonderfully illustrated]] with a DoubleTake ''at herself'', while the studio audience applauds.) In addition to random science-fiction analogies, she has quite a bit more patience and higher standards when it comes to dating.
** In ''The Werewolf Transformation", after missing one haircut, Sheldon "enters a world of chaos" and becomes about as badass as he could be.
* TrademarkFavoriteFood: Whenever the five main characters are eating together, it's Chinese food. Although it's not so much trademarked for Sheldon as it is ISO 9000 specified.

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* TookALevelInBadass: For a certain qualification of "badass." Leonard started off the series being painfully shy and uncertain of himself, it took him the entirety of the first season to officially ask Penny out. It's implied that interacting with Penny has helped boost his sense of self-worth and he progressed from being a [[NiceGuy nice]], [[TheGenericGuy generic guy]] to becoming scathing {{Deadpan Snarker}}s and having more of a potential love life than just with Penny. Just with his interactions with Penny he is much more comfortable being assertive and teasing her than he was before, no longer feeling he has to be submissive to stay on her good side.
** In parallel CharacterDevelopment, we've also seen Penny Take A Level In Nerd. (The first [[http://www.youtube.com/watch?v=vKXBqs]] with a DoubleTake ''at herself'', while the studio audience applauds.) In addition to random science-fiction analogies, she has quite a bit more patience and higher standards when it comes to dating.
** In ''The Werewolf Transformation", after missing , Sheldon "enters a world of chaos" and becomes about as badass as he could be.
* TrademarkFavoriteFood: Whenever the eating together, it's Chinese food. Although it's not so much trademarked for Sheldon as it is ISO.

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** But when it's just the four nerds together, they seem to have (slightly) greater variety in their diet. They go to various restaurants, including the Cheesecake Factory where Penny is a waitress. Also, at work they have generic cafeteria food together in some cafeteria presumably on the Caltech campus.
*** It completely covers Sheldon though. He has a strict menu that he eats per day, for all three meals, and presumably snacks as well. The Chinese food ''has'' to be from Szechuan Palace. (Unfortunately for Sheldon, they closed two years ago. Now his cashew chicken comes from Golden Dragon.) He's similarly disappointed to see that they've gotten Indian food from Mumbai Palace, not their usual Tandoori Palace. When Penny makes french toast for breakfast, he complains that it's "oatmeal day". When Leonard and Penny leave, he comments that the food does smell good, then finishes with "too bad it's not french toast day" and dumps the rest into the trash. He also seems quite fond of milk and tends to drink it more often than might be expected, ''especially'' if the other diners have wine or champagne.

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** But when it's just the , they seem to have (slightly) greater variety in their diet. They go to various restaurants, including the Cheesecake Factory where Penny is a waitress. Also, at work they have generic cafeteria food together in some cafeteria presumably on the Caltech campus.
*** It completely covers Sheldon though. He has a strict menu that he eats per day, for all , and presumably snacks as well. The Chinese food ''has'' to be from Szechuan Palace. (Unfortunately for Sheldon, they closed  ago. Now his cashew chicken comes from Golden Dragon.) He's similarly disappointed to see that they've gotMumbai Palace, not their usual Tandoori Palace. When Penny makes french toast for breakfast, he complains that it's "oatmeal day". When Leonard and Penny leave, he comments that the food does smell good, then finishes with "too bad it's not french toast day" and dumps the rest into the trash. He also seems quite fond of milk and tends to drink it more ofexpected, ''especially'' if the other diners have wine or champagne.

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** In "The Psychic Vortex" Raj and Sheldon managed to acquire dates with two very hot, intelligent and slightly geeky girls (one of whom played by [[TheWonderYears Danica McKeller]]) named Abby and Martha, and even got a second date shortly after. What made these girls really unique was that the ice-breaker was Sheldon carrying Franchise/GreenLantern's power battery at a party and ''they [[GeekyTurnOn fully knew what it was]];'' they ended up playing ''RockBand'' back at Sheldon's apartment. Not to mention that Sheldon even appeared to enjoy talking with Martha (discussing ''Literature/{{Flatland}}'' among other things) with Raj and Abby making out on the chair. It can be assumed that Sheldon's {{asexual}} nature really disappointed Martha, and that took Abby away from Raj. But these were girls who could relate to them in interests, intelligence and were attracted to them ''because'' of it (not even Penny can really claim that with Leonard), with no follow up episode it almost seems to be a waste.

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