"What about those perpetual motion cars! yea its feasible?'
Perpetual motion machines do not work if you draw any energy from them - for example a frictionless flywheel will spin forever, but if you attach it to the wheels of a car for power it will gradually slow as the energy originally required to spin it is drawn off by the car. As far as I'm aware there are no practical applications for perpetual motion machines apart from time measurement.
"Look into it some time.... basically, the heat from the fire separates the oxygen & hydrogen in the water before it even lands. What are oxygen & hydrogen? Damn good fire fuel!"
Hmm... not sure about that at all - if you apply heat to water it just turns to vapour, it doesn't break down into it's componant molecules. Besides, even if this is true (maybe at extreme temperates, I don't know) then it still doesn't work - the energy you draw from creating a molecule is exactly the same as used in breaking apart in the first place. So when you convert water into it's componant molecules you need shed loads of electricity. When you 'burn' hyrdrogen in oxygen atmosphere the heat released is equal, in energy terms, to the electricity used - and the byproduct is pure water vapour. Neither oxygen nor hydrogen burns on its own - it's just opposite sides of the same chemical process. So while hydrogen makes excellent fuel for cars (provides good amounts of power, not too complicated to store, and most importantly creates no exhaust fumes whatsoever besides water vapour) you still need a big smelly power plant to make the hydrogen in the first place.