Me and one of my roommates had an argument once about whether we were going to watch Letterman or Leno, and she noted that people who like one don't seem to like the other.
I remembered a George Foreman appearance on The Late Show years ago during which Foreman said that the guys at the airport had warned him about Letterman. Years before that, I'd heard a radio morning show where the hosts had somehow gotten David Letterman's home phone number and were offering a t-shirt or something if you phoned them and then managed to keep Letterman on the line for a minute. A guy called in, got put through to Letterman's house, and then had a five or ten minute conversation with him. I was late for class, but I sat in my car and listened to the whole thing because I could not believe how nice Letterman was being to this stranger and how the call just would not end. Even the radio hosts were reduced to giggling disbelievingly by the end. And just before the guy got off the phone, he says to Dave, "You know, my mom said you were going to tear me apart." And Letterman replies, "Mike, I only do that to people I know."
I like a talk show host that people need to be warned about. It doesn't happen much any more, but this interview recalls the classic Letterman - from his heyday hosting Late Night - when, if he thought his guest was an ass, he'd make them look like one. Just watch it already.