One of the most famous moments on Seinfeld was Elaine's dancing. It was an arrhythmic mess of pointing thumbs and jerky motions, and it could have you laughing until it hurt.
Oprah: I thought you were going to throw out a joint there. Okay, so obviously you haven't lived that down.
Julia: Evidently that will haunt me for the rest of my life.
Jerry: She said, "What do you think of this kind of thing?" And I thought, "Oh, I don't know, I guess that's bad." We were trying to come up with a really bad dance.