I've had a similar experience. One time my car wouldn't start after school let out. I had a friend and a neighbor in the car. Called another friend to help get it started, he rode over with his gf in her mkIII supra turbo. We tried to push start it with my neighbor (female) in the car. We had a short space to work with and she had no clue, the first try was unsuccessful. We started pushing it back into place to try again, but the car starting rolling too fast. We shouted at her to step on the brake, pull the ebrake, something, but she was an auto-only kinda person and got confused about which pedal to stomp. My car ended up ramming the back left of the supra with it's back right, I got two nice deep scratch/dents and the supra got the paint rubbed off of a good bit of the back corner. It sucked seeing my car rolling at 3 mph towards another car, but with too much momentum for the three of us to pull it to a stop .