Robin Williams: Comic Genius

An All-Star Toast to The Improv (3x8)

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To celebrate the 24th "birthday" of the famous Improv comedy club, 6 famous comedians get up on stage and do their thing. However, to make things interesting, while each one does his particular routine, the other 5 comics sit at the back of the stage and heckle the performer. This video is especially notable for Martin Mull issuing a zinger at Robin Williams that shuts-up the otherwise motor-mouthed comic for at least 5 seconds.