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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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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Sheldon gets into an argument with Stephen Hawking over a game of Words With Friends on The Big Bang Theory. "The Extract Obliteration" is the sixth episode of the show's sixth season.
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Wolowitz and Bernadette celebrate Halloween by dressing up as Smurfs on The Big Bang Theory. "Holographic Excitation" is the fifth 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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TBBT Quotes

You can't ruin a friendship with sex that's like trying to ruin ice cream with chocolate sprinkles.

Raj

Sheldon: Even the dung beetle chooses to plot its course by using the Milky Way.
Raj: Is that true?
Sheldon: Everything I say is true. Now, of course, the dung beetle also enjoys eating fece, living in feces and making little balls out of feces. So, pick and choose which aspects of its lifestyle you want to embrace.