Penny, Leonard and Amy toast Sheldon on "The Relationship Diremption."
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Barry Kripke shows up to talk to the guys during lunch.
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Penny and Leonard read a script so she can decide whether to take the role or not.
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Raj takes Penny's hand while Leonard sits next to her watching it unfold.
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Wil Wheaton returns and helps Penny decide whether to take a movie role or not.
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Is one of these players Stuart's killer in the Murder Mystery?
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The gang gathers around Stuart's body during the Murder Mystery party.
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The gang finds Stuart dead in the middle of the room and must solve his murder.
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Raj talks to his friends about the Murder Mystery Party.
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Raj hands Howard something during the game night with Sheldon and Leonard.
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Penny surprises both Leonard and Sheldon with her comment.
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Penny and Leonard chat in front of the still-broken elevator.
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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