The Aristocrats.

[mart]

No, not the Aristocats but what is reckoned to be the filthiest joke ever.
I've read a couple of very self-censored reviews of a new doco. about it.
Do a Google.

Mart

[colonel]

I saw part of the docu.- and it looked good.

Yes- I know the joke and filthier than filth it is too.

Do you know the Whoopi Goldberg 'reverse' version?

[Fred]

Reverse version better than the original IMO