You like science? You enjoy science? Always use it for good, never for evil. Can you promise me that?
David LettermanThere's already been some trouble for Osama bin Laden in the afterlife. There was a mix up and he was greeted by 72 vegans.
David LettermanMitt Romney is not going to be running for president. So you know what that means. We are getting closer and closer to 'President Trump.'
David Letterman