And check out the issue's thorough survey of some of the funniest mouths on issues like their big breaks and funniest jokes, as well as a telling Letterman Q&A.
My Favorite Joke:
"Guy’s having sex with his wife. All of a sudden he looks over, and there in the doorway is his son, about eight years old. Kid looks horrified, and the kid runs away. The guy says to his wife, “Well, I’d better talk to Timmy.” He puts on his clothes and goes to Timmy’s room. He opens the door, and there’s Timmy nailing Grandma. The father goes, “Oh, my God!” And the kid goes, “Not so funny when it’s your mom, is it?”--Robin Williams, RS 1061
And stay tuned for more online extras from the writer's cutting room floor.