A friend of a friend had just finished putting together his new ride, and decided to take it out around the block for a spin around midnight. Just a short ride, no helmet. A taxi turned left in front of him as he was speeding down a hill, and he flew over it and hit head first. He was in an induced coma for 2 weeks, during which they cut the top of his skull completely off to relieve pressure on the brain. It was put back on in another 1.5 weeks. Now two years later, he is a totally different person, according to my friend who knows him.