Stanley Meyer's water fuel cell
The water fuel cell is a technical design of a "perpetual motion machine" created by American Stanley Allen Meyer (August 24, 1940 – March 20, 1998). Meyer claimed that an automobile retrofitted with the device could use water as fuel instead of gasoline. Meyer's claims about his "Water Fuel Cell" and the car that it powered were found to be fraudulent by an Ohio court in 1996.