Some guys in England have bult a boat that is powered by human fat. Putting their money where their blubber is, the owner underwent liposuction to help power the thing, along with two volunteers; they produced 10 liters of fat, or about two and a half gallons American.
That doesn't seem like very much, does it? It's enough to move the boat only 15 kilometers, or about nine miles American. Clearly, they need to get John Popper involved.