http://www.metacafe.com/fplayer/707422/extreme_car_glass_crush_w_tiny_piece.swf
Extreme – Car Glass Crush W/ Tiny Piece! – The best free videos are right here

I’m not going try to explain the science behind Ninja Rocks ’cause, well, I don’t fully understand it. But basically, small chunks of spark plug ceramic can pwn tempered glass. It has something to do with the ceramic being a lot harder than the hard, but also brittle, glass. And according to the always accurate Wikipedia, Ninja Rocks are even considered burglary tools by the State of California. Anyway, watch the video after the jump and be prepared to be amazed. Just don’t try this at home.