Internet phenomenon, you say? Speak no further! Here's a movie deal!
Made famous in part by the Found Footage Festival, the obscenity-spewing, unspeakably frustrated Jack Rebney is the most famous Winnebago salesman in the world. Now there's a documentary that promises to go behind the YouTube (Christ, I'm half-surprised they didn't use that as the movie's tagline) to show us who the real Jack Rebney is.
Doesn't look half bad, though I'll be keeping my fingers crossed that he flips out on the documentary's filmmakers at least once.