Sheldon makes Leonard pays for a past mistake on The Big Bang Theory. "The Itchy Brain Simulation" is the eighth episode of the show's seventh season.
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Sheldon feels like a fraud with his latest scientific breakthrough on The Big Bang Theory. "The Romance Resonance" is the sixth episode of the show's seventh 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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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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Game night turns into a messy battle of the sexes on The Big Bang Theory. "Re-Entry Minimization" is the fourth episode of the show's sixth season.
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Sheldon tries to intervene when he discovers a secret about Penny and Leonard on The Big Bang Theory. "The Decoupling Fluctuation" is the second episode of the show's sixth season.
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TBBT Quotes

Howard: Attention people of Earth: Tonight, there will be two moons in the sky.

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.