The Aristocrats: 7 out of 10.
The tagline for "The Aristocrats" is "No Nudity No Violence Unspeakable Obscenity". That pretty much sums it up. The language is as obscene as you can imagine, but once you get used to it, this is one funny doc.
The joke itself isn't that funny, but when Sagat and Silverman tell it, it's hilarious.