Leonard: I'm gonna get some coffee. You want some?
Sheldon: Uh, you're really going to have caffeine in front of me when I'm trying to get my life back on track?
Leonard: Uh, okay, let's pretend you do have a problem.
Sheldon: I do.
Leonard: You don't.
Sheldon: Yeah, but I do.
Leonard: No, you don't! But let's say you do. And don't say you do, because you don't! Now, wouldn't you think that throwing yourself into your work would be the best way to deal with it?
Sheldon: With what?
Leonard: Your problem.
Sheldon: I thought I didn't have a problem.
Howard: That was painful to watch.