David Letterman: What's with This Douche Thing?
Sure, he's curmudgeonly and crotchety. Sure, he had an affair with Stephanie Birkitt and got blackmailed for it. But David Letterman is great at what he does.
That's due in part to his ability to create great comedy out of nothing. When he goes over to his desk after the monologue, you never know what’s coming.