A few years back I came out of a friends house, which was on a bit of a hill, to find my car (not a Z) nowhere to be seen, I was about to go back and phone the law thinking it had been nicked, when I glanced a hint of shiny blue paint peaking out of a hedge about a hundred yards down the road....managed to extract it and found no damage, the hedge looked OK too, I can only suppose that due to the brakes being hot when I pulled on the hand brake, that they cooled and allowed the car to roll, I now tend to put it in gear when leaving it.