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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Leonard and Penny throw a cocktail party but are their friends adult enough to enjoy it on The Big Bang Theory? "The Closet Reconfiguration" is the 19th 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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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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TBBT Quotes

Penny: What actor holds the record for being named People magazine's Sexiest Man Alive?
Sheldon: William Shatner!
Leonard: I don't think it's Shatner.
Sheldon: Then it's got to be Patrick Stewart

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