As Leonard and Raj go to get Wolowitz from his house for their Halo team they overhear his mother fighting with his new girlfriend.
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Wolowitz shows up in an awfully feminine robe after sleeping with Penny's friend and forcing Penny to crash on Leonard and Sheldon's couch.
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Penny joins the boys for a game of Halo and they're a little shocked that she's not bad at the game.
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Raj has every reason to be smiling in bed as he lays next to a woman he took to bed with him. Go Raj!
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A picture of Leonard and Penny kissing in costume after Penny's ex-boyfriend is a jerk to Leonard at her Halloween Party.
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After Leonard leaves the party embarrassed by what her jerk of an ex said, Penny comes over to comfort Leonard. She's dresses as a kitten.
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Sheldon and Leonard open the door at Penny's Halloween Party dressed like quite the nerds as Penny's large friend enters the apartment.
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Wolowitz dresses up as Robin Hood for Penny's Halloween Party and here's a pic of him talking to the guys.
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Leonard, Sheldon and Raj sit on the couch at Penny's Halloween Party all dresses in costume.
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Leonard join Leslie's string quartet at the cellist. However, we all know the real reason Leslie invited Leonard to join.
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The boys go to eat dinner at the restaurant where Penny works as a waitress and she serves the guys.
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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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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, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon