Jump the shark with AquaSkipper

Wednesday's episode of Lost may have saved it from jumping the shark, but its writers may want the AquaSkipper from Inventist just in case.

The 6-foot-long self-propelling Jet Ski is made of aircraft aluminum and has a wingspan of seven feet. A fiberglass spring on the AquaSkipper responds to a hopping motion to propel it forward.

The hydrofoils on the human-powered Jet Ski create minimal drag, which allows it to go up to 17 miles per hour, according to Inventist. As you can see from this video, water-skiers wishing to exert less effort can also "sail" (or surf) along currents or ocean tides.

Besides riding waves, the AquaSkipper could be a practical vehicle for getting out your moored Porsche yacht, flying speedboat or Paritet Boat quickly. Instead of struggling with a row boat, you could just throw the 26-pound AquaSkipper into the boat and go. The device folds up and fits in a duffle bag.

The only drawback to the air-, noise- and water pollution-free vehicle is its $500 price tag. Even though the only fuel it burns is calories, that's still pretty steep.