I did that once in a Saab. Stopped for gas at one of those stations that you could buy gas after it closed by using a card at the pump. It's about midnight, and I'm doing my deal with the card at the pump, grab the nozzle and turn around, no car. Just the weirdest feeling, I'm looking around thinking maybe I got turned around and was at the wrong pump, nothing. Turns out the car rolled down the hill, through a pretty busy intersection and came to rest in a field about 50 yards away. I'm amazed it didn't hit anything because there were several cars stopped at the light just a minute before.

What a sickening feeling.