On vacation  short while ago, NBA player Tony Parker rented a water-powered jetpack and it got a lot of attention.   They're cool because you aren't using rocket fuel, you're using water - less cool is that you are actually renting an entire boat and an engine and you are tethered to it while it pumps the water into the system, making it a toy for the idle rich.   On a Fox morning show, TechCrunch notes, an overenthusiastic Jetlev R200 user surprises the on-camera reporter with some premature ignition.  Hilarity ensues.