I used to work at a new car dealership, I didn't have a whole lot of experience. I get a new truck in that the customer wants running boards installed on. I get it up on the lift and start working on it. I get one side loosely on and bend down to do something then the back of the truck falls off the lift and the sides land on the lift arms. For some dumb reason my instinct was to try to catch the truck. Fortunately I wasn't crushed. The problem was that the lift arms did not lock into position, the lift pads were round rubber pads which were pretty smooth and the truck frame had just been undercoated. The lift arms just decided to both slip inwards. They said it wasn't even the first time something like that had happened with that specific lift.
The damage was pretty bad because that running board that was loosely installed bent up the rocker panel. Both bed sides were damaged.