Harvey Pekar cramps David Letterman’s style in 1988. After this infamous appearance, he was banned for life. (Not really though).
Pekar would later tell the Los Angeles Times: “On some of the shows, I was doing a deliberate self-parody, and now there’s a lot of people that think I’m some sort of maniac, you know? I think that’s unfortunate — I’d rather be liked than thought of as a crazy man, but with Letterman, I’ve been in a situation where you either lay down and let him insult you or you do something about it. Most people keep their mouth shut and let him dump on them. I don’t wanna do that.”