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.
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.
Stuart (Kevin Sussman) flirts with Penny as he givers her a portrait he drew of her in exchange for her phone number. Wow, Penny is falling for the nerds hardcore now.
Sheldon: I'll have a diet Coke. Penny: Can you please order a cocktail? I need to practice mixing drinks. Sheldon: Fine... I'll have a virgin Cuba Libre. Penny: That's... rum and Coke without the rum. Sheldon: Yes, and would you make it diet?