When Einstein died and arrived at the gates of heaven, St. Peter wouldn't let him in until he proved his identity. Einstein scribbled out a couple of equations, and was admitted into paradise.
When Picasso died, St. Peter asked, "How do I know you're Picasso?" Picasso sketched a couple of his masterpieces. St. Peter was convinced and let him in.
When George W. Bush died, he went to heaven and met the man at the gates. "How can you prove to me you're George W. Bush?" Saint Peter said.
Bush replied, "Aw heck, I don't know."
St.Peter said, "Well, Albert Einstein showed me his equations and Picasso drew his famous pictures. What can you do to prove you're George W. Bush?"
Bush replied, "Who are Albert Einstein and Picasso?"
St. Peter said, "C'mon in George. It must be you."