Hygrogen fuelcell RC car is real
 

Found this on RC Groups
http://www.rcgroups.com/forums/member.php?u=29974

I've seen a smaller version available for commercial intentions.

I know, i posted the link to it. This one is a larger scale (1/10) and more or less a homemade creation

I wonder if a few caps would help the voltage stabilize a little on acceleration? It might be tough to find a compromise between cap size and effectiveness.

That's freaking awesome!