Man invents water-powered car. No, really.
Link:
http://www.youtube.com/watch?v=4FBH4_FWBVAThis is setting off my bullshit-o-meter, because I find it hard to believe you can crack water molecules into an energetic gas without there being a greater energy cost somewhere along the way. OTOH if it actually works as advertized... Well, you can kiss the oil companies, coal companies, nuclear power industry, and who know who else buh-bye...