Howard: That's your card, right?
Penny: Seven of clubs! That is amazing!
Sheldon: It's not amazing. All magic tricks are merely a combination of manipulation and misdirection with the occasional dwarf in a box wiggling his feet.
Howard: Oh, really? So how did I do it?
Sheldon: Well, I don't care how you did it. I have more important things to think about. Clearly, the cards are marked.
Howard: I thought you had more important things to think about.
Sheldon: I do. You just happen to have caught me on a break.