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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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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Penny talks to Leonard about an embarrassing movie role she's offered.
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TBBT Quotes

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

Sheldon: Why do you have the Chinese character for "soup" tattooed on your right buttock?
Penny: It's not "soup," it's "courage."
Sheldon: No it isn't. But I suppose it does take courage to demonstrate that kind of commitment to soup.
Penny: How'd you see it? You said you wouldn't look.
Sheldon: Sorry. As I told you, the hero always peeks.