Aristocrat joke?

What is the aristocrat joke!?
I have heard of it but what is it¿

It's an open ended joke. It starts with a family going into a talent execs office, where the father proceeds to tell the guy his family has a trick they perform. The person telling the joke now gets to say the most vile, perverse things he/she can think of, and then they end it with "We call ourselves 'The Aristocrats!'" It's supposed to be funny because aristocrats are traditionally known as prim and proper, high society people; and this family is anything but that.

There is actually a movie about this with 25 well known comedians telling their own versions of the joke.

I think it came out about 2002 or there abouts.