This is a video everybody has to watch. Though most of us don't have chains and drive belts, there is still a huge danger of loose clothing (and costumes) getting caught in the moving parts.
Another comment I have as a truck driver, notice everyone's reaction up to the point of the black pick-up driver. When you are on a highway you always see cars hitting their brakes regularily, and swinging between lanes. People tailgate and they are on the gas, on the brakes, on the gas, on the brakes... As a truck driver, when we see someone hit their emergency lights, we are standing on the brakes and down shifting until we get it sorted out what is going on ahead, or if there is debris ahead. That rider wasn't debris, he needed a thinking person to get traffic stopped.
http://www.youtube.com/watch?v=UJuqIdnUhq4

