Dirtiest Joke Ever

South Park does the "Aristocrats" joke. (WARNING! Windows Media file, very very not safe for work.) "The Aristocrats" is a long-lived comedians' in-joke--or, rather, an extraordinarily filthy joke that's not really a joke. (Gilbert Gottfried knocked 'em dead with it shortly after 9/11.) Now it's going public (sort of): Penn Jillette and Paul Provenza are making a movie featuring over 100 comedians telling their own versions. The South Park version linked above is "not even in the top 5 for dirtiest." Yikes!