Winnebago Man is a 2009 American documentary film directed by Ben Steinbauer. The film follows the Internet phenomenon created by a series of twenty-year-old outtakes from a Winnebago sales video featuring profane outbursts from a salesperson named Jack Rebney. Originally intended as an inside joke, the video spread across the globe—first on VHS, and then via YouTube and other online video sites, earning the salesman the title of "The Angriest Man in the World". The documentary explores the story of the clips' origins and how, two decades later, it affects the reluctant star.
(Summary from Wikipedia)