I was working on a 4x4 Nissan truck replacing the rear seal in the trans. I had drove the truck up on the ramps and started taking the drive shaft out. Well...you guessed it. I pulled the drive shaft out and the truck started rolling down the ramps. Lucky for me the truck had a suspension lift on it with some pretty big tires, there was no time to get out from under the truck so I turned my body longways with the truck and it rolled right over me. Needless to say, I always chock the back tires now.
Chris