The girls remember some of their most embarassing moments on The Big Bang Theory. "The Troll Manifestation" is the 14th episode of the show's eighth season.
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?