When Sheldon discovers a necktie on Leonard's door he runs to Penny to find out what it means. Penny explains to the clueless nerd.
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Sheldon brings home his stuff after he gets fired from his job at Caltech after insulting his boss.
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Leonard goes out with just Penny on a dinner date that Penny originally thought was going to be a group dinner.
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Looks like Sheldon, Raj and Wolowitz were clearly too busy for their group dinner date with Penny. They have important things to do... like play Jenga!
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Leonard asks out Leslie in an attempt to get over his "rejection" by Penny but ends up being turned down by Leslie as well!
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Only Leonard would use a light saber to light up an otherwise dark Penny's apartment. Wow we wish we could embrace being this nerdy.
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Sheldon and Leonard look extremely shocked as they enter Penny's messy apartment. Sheldon is extremely bothered by how messy she is.
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Sheldon and Leonard attempt to move Penny's delivery package up several flights of steps.. It really is a shame that elevator is always out of order.
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Penny fits right in with the gang as they sit down to eat their signature food... Chinese takeout.
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Penny meets Raj and Wolowitz in the pilot episode of The Big Bang Theory. Wolowitz will begin his lifetime of sleazily hitting on her while Wolowitz is unable to talk to her.
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Sheldon and Leonard are about to experience a new life now that Penny moved in next door. By Sheldon and Leonard we really mean Leonard.
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The boys gather around their killer robot, MONTE, getting ready to test him out before the big competition in the latest episode of The Big Bang Theory.
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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.