Koothrapali refuses to leave his apartment after a bad date on The Big Bang Theory. "The Monster Isolation" is the 17th episode of the show's sixth season.
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Who would guess that Penny and Leonard's Valentine's day wouldn't go as planned on The Big Bang Theory? "The Tangilble Affection of Proof" is the 16th episode of the show's 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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The boys head to a comic book convention dressed as Star Trek: The Next Generation characters on The Big Bang Theory. "The Bakersfield Expedition" is the 13th 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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The ladies search for a girl for Koothrappali when he joins them on a night on the town on The Big Bang Theory. "The Santa Simulation" is the 11th 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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TBBT Quotes

Mrs. Cooper: Shelly! I'm so glad you're here!
Sheldon: I saw you having naked sex.

Penny: I give up, he's impossible
Sheldon: I can't be impossible, I exist. I believe what you meant to say is, "I give up, he's improbable."