Yes, the water powered car again. The unit claims to produce Hydrogen & Oxygen by the electrolysis of water, which then get burnt in a torch. You only get the flammable gas out of the water if you pump energy into it*, and you get out less energy than you put in. If you produce vast quantities of a mixture of Hydrogen & Oxygen gas and store it somewhere around the house for your next trip to the office the effects of a static spark or a passing smoker could be interesting...
Makes sense in this application though, coz it is burnt as it is produced. The claim: "An Aquygen™ flame in open air burns at only 259° F, but applied to a substrate it can produce temperatures of over 10,000° F" seems incredibly dodgy. On its own it isn't hot enuf to cook a pie, but if you apply it to a bucket of petrol maybe it is more interesting. I thort it burnt hotter than that though, the met guys seem to take it's hazards fairly seriously.
*From wikipedia
The extraction of H2 from water or hydrocarbons requires energy; these are endothermic processes. H2 cannot be produced from water or hydrocarbons without the expenditure of energy, and this problem is the central quandry confronting hydrogen production.