Sheldon and Leonard's paretns have an awkward family visit on The Big Bang Theory. "The Convergence Convergence" is the 24th episode of the show's ninth season.
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A heated argument breaks out during a get-together on The Big Bang Theory. "The Viewing Party Combustion" is the 21st episode of the show's ninth season.
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The boys run into problems when they file for a patent on The Big Bang Theory. "The Application Deterioration" is the 18th episode of the show's ninth season.
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Sheldon is thrilled when Meemaw visits on The Big Bang Theory. "The Meemaw Materialization" is the 14th episode of the show's ninth season.
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Sheldon collaborates with Koothrapalli on a discovery on The Big Bang Theory. "The Sales Call Sublimation" is the 12th episode of the show's ninth season.
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After five years of dating, Amy and Sheldon spend their first night together on The Big Bang Theory. "The Opening Night Excitation" is the 11th episode of the show's ninth season.
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Sheldon has a revelation about a song stuck in his head on The Big Bang Theory. "The Earworm Reverberation" is the tenth episode of the show's ninth season.
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Amy and Sheldon spend Thanksgiving together at the aquarium on The Big Bang Theory. "The Platonic Permutation" is the ninth episode of the show's ninth season.
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Sheldon is interviewed for a Spock documentary on The Big Bang Theory. "The Spock Resonance" is the seventh episode of the show's ninth season.
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Sheldon and Leonard hit the black market looking for helium on The Big Bang Theory. "The Helium Insufficiency" is the sixth episode of the show's ninth season.
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The boys take fencing lessons and Sheldon ends up in an awkward position with the instructor on The Big Bang Theory. "The Perspiration Implementation" is the fifth episode of the show's ninth season.
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Sheldon decides to revert back to life in 2003 on The Big Bang Theory. "The 2003 Approximation" is the fourth episode of the show's ninth season.
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TBBT Quotes

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.

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