Fire-hose Rocket Pack

Jet-Lev Flyer is a water-driven "rocket pack." It's not that hard to explain, but watch the video. I don't think this is quite my style of personal flying machine (though probably much cheaper than a Cirrus or a Cessna), but it's pretty cool as long as you don't mind flying over a body of water to a maximum altitude equal to the length of the intake hose. I like this statement on the company's safety page: "For a jetpack, the Jetlev has excellent inherent stability" (they go on to explain why in terms of center of gravity and such).