The Aristocrats/Sophistocates.

[DehydratedPorkMan]

So this movie from about a year or two ago comes out. It has about 100 comedians telling the same joke over and over. The basis is that a man goes into a talent agent's office and has to pitch a family act to him. This is where you ad-lib and make the most disgusting or obscure act you can think of and stretch it out to however long you would like. At the end, the talen agent asks what the act is called and the man says, "the Aristocrats!"
The joke sucks but it is a great forum for people to show off whether they're a hack or a really good/funny story teller.
So the basis of the joke is:
"A man walks into a talent agent's office and he says, 'I've got a great family act for you and I would like you to hear about it.' The talent agent says, 'Okay, tell me,' and the man goes..."
*ad-lib*
"The talent agent asks, 'What do you call this act?' and the man says, "The Aristocrats!"
I would start it off but this is already long enough. Hopefully someone who has seen this movie will kick it off and then I'll tell mine.