Madonna's infamous appearance on Letterman's show in March 1994. I was in the audience for this taping, the main guest was originally supposed to be Dennis Hopper, so we were pretty excited to have tickets to see him. Then it was announced the day of the taping that Madonna would make her first guest appearance so we got there early as they always overbook the seats.
When she first cursed I figured it would be like when Cher called him an asshole, and then the conversation would move on. But she just kept at it.
Paul and the band were super loud, which was cool. They keep playing through the commercial breaks so there is no lull.