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.
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?