Gadget Road has a neat article about the world's strangest jet-powered vehicles. This one above is the jet-powered toilet, created by Paul Stender. The cost? $10,000 but hey, it can go up to 70 mph!
http://www.gadgetroad.com/cars-bikes/excentric-and-amazing-jet-powered-vehicles/2007/06/18/ (with YouTube goodness) | Jet Powered Toilet