Put some clothes on Penny! Actually, what are we thinking? Remain as you are.
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Sheldon hires Professor Proton (guest star Bob Newhart) to come to his apartment on The Big Bang Theory. "The Proton Resurgence" is the 22nd episode of the show's sixth season.
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Amy tries to help Sheldon deal when his favorite TV show is cancelled before its proper conclusion on The Big Bang Theory. "The Closure Alternative" is the 21st episode of the show's sixth season.
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Sheldon may experience a roadblock to gaining tenure when he has a history with someone from HR on The Big Bang Theory. "The Tenure Turbulence" is the 20th episode of the show's sixth season.
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Sheldon, Howard, and Leonard give a presentation about careers in science to a group of girls in junior high on The Big Bang Theory. "The Contractual Obligation Implementation" is the 18th episode of the shows sixth season.
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Leonard and Sheldon's fight spills over into everyone else's lives on The Big Bang Theory. "The Spoiler Alert Segmentation" is the 15th episode of the show's sixth season.
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Sheldon reacts badly when he finds out he had to work with Barry Kripke on The Big Bang Theory. "The Cooper/Kripke Inversion" is the 14th episode of the show's sixth season.
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Will Sheldon win against a sexual harassment accusation the same way he can at Jenga on The Big Bang Theory. "The Egg Salad Equivalency" is the 12th episode of the show's sixth season.
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Will Sheldon be able to play nursemaid when Amy takes ill on The Big Bang Theory. "The Fish Guts Displacement" is the tenth episode of the show's sixth season.
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Sheldon doesn't take it well when his university parking spot is reassigned on The Big Bang Theory. "The Parking Spot Escalation" is the ninth episode of the show's sixth season.
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Howard and Raj make it their mission to figure out where Sheldon is headed on The Big Bang Theory. "The 43rd Peculiarity" is the eighth episode of the show's sixth season.
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Sheldon gets caught in the middle between Amy and Will Wheaton on The Big Bang Theory. "The Habitation Configuration" is the seventh episode of the show's sixth season.
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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.

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.