This is pretty bizzare. Hyper-Cerebral Electrosis http://aether.lbl.gov/www/classes/p139/explode.html It seems that a chess champion's head actually exploded when he thought too hard for too long! :-) That's pretty darn gross! They continue Moral of the story - Don't think too hard or you head might explode. :-) What I don't get is how the pressure could build to such an extent that the head explodes? Is blood being pumed to the brain so much by the heart that the skull cracks and explodes?