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?
Leonard: Do you really need the Honorary Justice League of America Membership card? Sheldon: It's been in every wallet I owned since I was five. Leonard: Why? Sheldon: It says keep this on your person at all times. It's right here under Batman's signature.