I believe that David Letterman is the greatest talk show host that ever hosted a talk show. He'd be the last person to say that and he'd probably be horrified to hear that, but I really do believe that. Anything I do, I feel, is a pale imitation at best of what he does. I just try to do whatever I can not to imitate him, because that is the inclination when you idolize somebody, when you watch the show every night growing up as a kid.
We use puppets because they can get away with more.
He's a very driven, very focused and very dedicated guy, and it's basically like a dictatorship working with him. He's not scared to tell you that your idea sucks.