Some call them Frybrids and WorldChanging has a really cool scoop. Others call them GreaseCars. What do they have in common? The run on "yellow oil", the rancid frying grease of fast food restaurants, school cafeterias and regular household kitchens.

I had no idea that rancid cooking oil is actually traded and that it goes now for about .33/gallon. That means that a standard restaurant grease storage bin (which can store about 300 gallons of grease) can go for $6,000 on today's market. And that's the reason why there's been a rash of greasenappings all across the United States.

The video here shows how one high schooler uses his schools' used frying oil to power up his Volkswagen. Check it out.