Cool! I didn't know that either!
I found this on a website, and i never knew he guest starred on anything else. I posted this for all of you Seinfeld fans.
[ame="http://www.youtube.com/watch?v=G0VZ2cd6jvE&feature=player_embedded"]YouTube - Kramer in Mad About You[/ame]
Kramer was such a nut!