Johnny.

I'm finally getting around to watching last night's Letterman show, the tribute to Johnny Carson. God, we loved that man! And David Letterman does such a good job with a show like this. He's got that sweet, funny humility of his. David does a monologue and then reveals later that all the jokes were written by Carson and sent on to Letterman. One guest on the show talks about how, after his retirement, Johnny read the newspaper and wrote jokes for his own amusement. Somehow the choice was made to send the jokes on to Dave.