Sheldon attempts to befriend Kripke in order to use his super computer at work. As a result, Sheldon is forced to go rock climbing and isn't too happy with the height.
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?