While I worked @ a Saturn dealer outside Boston, we had a "technician" (I use the term loosely) improperly place the arms under the body of a very good customer's '95 SL2. It was wet out, so the cars were damp. I don't know how the car got in the air, because it was only being supported by the plastic undercladding.
The issue was that he casually kicked the arms under the car, not ensuring they were placed on the jack points. Good techs who have been working on a given car brand for a long time know when the lift points are successfully covered. This tech didn't have that luxury.
After it was in the air for a few minutes, the car just sort of slipped off. Short of gun shots, it was the loudest noise I've ever heard.
I know the car needed some bodywork and maybe a few suspension things replaced, but from a 5' 6" height, it didn't do that much damage. And nobody was hurt.
This event was the beginning of a long spiral downward for the "technician."