Jerry: I think Superman probably has a very good sense of humor.
George: I never heard him say anything really funny.
Jerry: But it's common sense. He's got super strength, super speed. I'm sure he's got super humor.
George: You would think that, but either you're born with a sense of humor, or you're not. It's not going to change even if you go from the red sun of Krypton all the way to the yellow sun of the Earth.
Jerry: Why? Why would that one area of his mind not be affected by the yellow sun of Earth?
George: I don't know. But he ain't funny.