Penny and Leonard return from their first date and Penny tells Leonard she wants to take it slow. Poor guy.
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Penny hugs Leonard after he does his best to comfort her after he ex reveals intimate details about her on his blog.
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Leonard and Penny are about to kiss in this still. Leonard finally asked out Penny on a real date after she was hurt by her ex.
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Wolowitz uses his peanut allergy to try and distract Leonard long enough for Penny and the gang to set up her surprise party.
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Leonard and Wolowitz try desperately to hit on Sheldon's attractive twin sister Missy (Courtney Henggeler) without much success.
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Penny humiliates Leonard about his toys and he decides he's going to get rid of all his nerdmabilia in this episode of The Big Bang Theory.
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The guys gather round Leonard as he sits in his time machine which arrive. The time machine is, of course, the prop from the 1960 movie that he bought off ebay.
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The boys gather around Leonard as he gets the winning bid on the time machine from the 1960 movie <i>The Time Machine</i>.
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When Leonard kicks Sheldon out of his trivia group, be brings in Leslie Winkle to replace him for their team, PMS.
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Leonard and Sheldon stand behind the 15-year-old science prodigy Dennis Kim (Austin Lee), who is about to prove to the guys he's smarter than them.
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Leonard and Sheldon meet Dennis Kim, a 15 year old childhood prodigy that makes them question their intelligence, especially Sheldon.
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Being the little nut job that he is, Sheldon runs a few tests after Penny comes back from Nebraska with a cold.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.