Years ago I saw a door car break a rear u-joint on the burn out. It went up through the alum interior and punched a big hole out of the roof of the car. :shock: As far as I know they didn't find the part. Who knows how far it went.
I saw an altered have the driveshaft come loose on the burn out and smack the driver in the nuts. It bent the center of the seat up a good 2 or 3 inches. I still remember him down on his knees against the wall.