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?