Penny: So, how's the book coming along?
Leonard: Uh, good. I just wrote the part where the hero, hotshot physicist Logan Dean, arrives at CERN.
Penny: Oh, is he based on you?
Leonard: Uh, kind of. But he can eat dairy products without having to leave the room.
Penny: Yeah, that's smart, because CERN is in Switzerland and there's a lot of cheese there.
Leonard: Hmm. Uh, believe me, that is a plot point later.