My Dad was on the rescue squad for many years in the little town I am from. one of his favorites was:

Local racer put 2X6's on cement blocks and drove the front end of his big block Challenger up on them and put it in Park. He then proceeded to pull the trans pan and pull the valve body out. Car rolled down and the driver's side header went down on his chest. Only thing that saved his life was he had the torsion bars cranked up 4wd high.