($29.99) The title is the punch line to a spectacularly dirty joke that comedians have been telling each other for years. In a fascinating documentary, scores of comics (including George Carlin, Paul Reiser, Bob Saget and Sarah Silverman) riff on, deconstruct and analyze the joke, like jazz musicians exploring a melody. Extras: Fun commentary by co producers Paul Pro venza and Penn Jil lette, outtakes, and Phyllis Diller telling a dandy Monica Lewin sky joke. (Not rated)
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