Medary.com

Or both? The Kansas City Star discusses:

It is by all accounts the world’s filthiest joke. Filthy not because of what’s in it, but because nothing is in it, and each teller is expected to dredge his darkest recesses to fill it up.

A man walks into a theatrical agent’s office and announces that he has the most amazing family act ever. He then goes on to describe an unyieldingly lurid performance involving himself, his wife, their young children and perhaps a grandparent and a family pet. No bodily function goes unmentioned, no sexual perversion is omitted.

When it’s over the agent is aghast: “That’s the most disgusting thing I’ve ever heard. What do you call this act?”

The man swells with pride: “The Aristocrats.”

Hey, it's got Penn and Teller in it. Snookums and I may have to go check it out for ourselves . . .