Phil Torrone over at MAKE spotted this curious toilet paper contraption in a listing for a 3 bed house in Wausau, WI. It appears to be a pedal-powered wiper, perhaps for amputees. Try not to think of the crap sopped, fly-covered "used" roll that would be the end result of such an invention. Just marvel at its genius.
The comments are particularly illuminating: apparently, in addition to appearance in Mad Magazine, this was a device featured in a 1980s game show called "Invention" in which one" patented fake inventions and earned money on them somehow." For some reason, those rules sound familiar.