Audiences in England may be puzzled by the success of The Aristocrats, a documentary about an obscene joke that - as the various US and British comedians interviewed explain - really isn't that funny.
The gag (which has been around for more than 100 years, and involves one man's description of his family's filthy stage act) has become something of a legend within comedic circles because it offers a blank canvas - no two comedians tell it the same way.
There are famous personalities here (Robin Williams, Eddie Izzard), cult ones, too, like Curb Your Enthusiasm's Richard Lewis; some are hilarious, some not.
What unites most of the talking heads is that their version of the obscene joke involves violence towards women and young girls, specifically aimed at their genitals. All rather wearing.
What's most off-putting, however, is the pervading air of smugness. Watching these professionals crack up at one another's (and their own) jokes is like being forced to attend someone else's office party.
The Aristocrats
Cert: 18
