Leonard: Hey, is Sheldon working on our project again?
Colonel Williams: Did he say that?
Leonard: No, he wouldn't tell us.
Colonel Williams: Huh. So he can keep his mouth shut. How do I get him to do that?

Howard: Why would the military want Sheldon?
Leonard: I don't know. Target practice?

Barry Kripke: Whoa, whoa, whoa. You didn't tell me we were doing this just to stick it to Sheldon.
Leonard: Well-
Barry Kripke: I messing with you. This sundae just got a cherry on top!

Sheldon: And worse than that, Edison filmed the first on-screen kiss, so he's basically a pornographer. Although every time I put that in Wikipedia, someone takes it out.