The mythbuster guys Adam and Jamie explains parallel processing on a gpu with a paint ball gun robot at the NVIDIA nvision 08.
DON'T TRY THIS AT HOME.
Wow, that's pretty awesome. So basically it's just a whole bunch of barrels with different colored paintballs? Not exactly a robot, but cool nonetheless. :)
Mythbusters is one of two shows that I actually watch ... most TV these days just sucks. I hope they keep that show going!