Penny and Leonard listen to an upset Sheldon. Things with he and Amy have taken a turn, and now, he's the one who has made the decision to just be friends. Does he regret it?
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You know things are getting serious when the guys break out more than one white board to work on their equations. Anyone else wonder what the heck these things really mean?
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Sheldon has a revelation of some sort as he tries to figure out why a certain song is stuck in his head. Is Leonard helping out? Are there equations involved? Most likely!
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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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The guys set up an online advertisement to find Sheldon a new girlfriend.
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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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Let's form a band! That's the idea Howard and Raj discuss in this scene from The Big Bang Theory Season 9.
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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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The boys are must figure out what to do when they get a flat tire on The Big Bang Theory. "The Bachelor Party Corrosion" is the third episode of the show's ninth season.
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TBBT Quotes

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

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon