Leonard: What do you mean, you're moving out? Why?
Sheldon: There doesn't have to be a reason.
Leonard: Yeah, there kinda does.
Sheldon: Not necessarily. This is a classic example of Münchhausen's Trilemma. Either the reason is predicated on a series of sub-reasons leading to an infinite regression, or it tracks back to arbitrary axiomatic statements, or it's ultimately circular, i.e. I'm moving out because I'm moving out.
Leonard: I'm still confused.
Sheldon: Leonard, I don't see how I could have made it any simpler.

Leonard Nimoy: I'd say this vessel could do at least Warp 5.
[crowd laughs]
Mayor Quimby: And let me say, "May The Force be with you."
Leonard Nimoy: Do you even know who I am?
Mayor Quimby: I think I do. Weren't you one of the Little Rascals?