St. Peter says, "You'll have to prove to me that's who you are."
Einstein takes a piece of paper, writes E=MC squared, and then starts writing the formulas that lead him to it.
St. Peter says, "I believe you, come on in."
Picasso takes out a pencil and paper and starts to draw.
St. Peter says, "I believe, you come on in."
George W. Bush says to St. Peter, "Who were those guys?"
St. Peter says, "Come on in, George."