Ummm... Yeah... So at least Bobak got it at first that it's a trailer for the movie The Aristocrats...
"In the film The Aristocrats (which I think is directed by Penn Jillette of Penn and Teller infamy, and was just screened at Sundance) they get 100 different comedians (Drew Carrey, Chris Rock, Robin Williams, Eric Idle, Jon Stewart, etc) to tell the same joke, each improvising the middle bit differently but with the same punch line. Could be awesome."