The Arbiter of common sense
Inigo Montoya: You are wonderful. Man in Black: Thank you; I've worked hard to become so. Inigo Montoya: I admit it, you are better than I am. Man in Black: Then why are you smiling? Inigo Montoya: Because I know something you don't know. Man in Black: And what is that? Inigo Montoya: I... am not left-handed.