Late Show with David Letterman S13 E53 Stupid Pet Tricks, Claire Danes, Big Boi

President Bush drops by the theater but somehow gets himself locked out; in honor of Oprah's appearance next week, Dave gives everyone in the audience free vodka and Lipitor; throughout the night, Professor Robert Mundell tells Rodney Dangerfield jokes; Alan abruptly starts singing The Black Eyed Peas' "My Humps."