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"The Aristocrats" is a taboo-defying, off-color joke that has been told by numerous stand-up comedians since the vaudeville era. It relates the story of a family trying to get an agent to book their stage act, which is remarkably vulgar and offensive. The punch line reveals that they incongruously bill themselves as "The Aristocrats". When told to audiences who know the punch line, the joke's humor depends on the described outrageousness of the family act. Because the objective of the joke is its transgressive content, it is most often told privately, such as by comedians to other comedians.

The joke came to wider public attention when Gilbert Gottfried told it during the Friars' Club roast of Hugh Hefner to recover after losing the crowd and eliciting "booing and hissing" with a joke about the 9/11 terrorist attacks, which had occurred just 18 days prior. The 2005 documentary film of the same name by Paul Provenza and Penn Jillette featured numerous comedians discussing and retelling the joke. Jillette has claimed the routine was Johnny Carson's favorite joke of all time.

Full article: The Aristocrats