http://www.youtube.com/watch?v=RkTvDjhImwo
The video above shows a guy building a circuit which can, at least due to my basic physics knowledge,not work.
Welcome to the wooly world of troll physics. This guy has been at it for a while, the comment threads here have cracked most of them: http://hackaday.com/tag/troll-physics/
It could be some kind of hidden circuit maybe. Or some kind of inductive energy?