[motion]

When I was 16 or 17, I drove to a friend's house and parked my '67 Ford Fairlane in his driveway in park and went up to his front door to knock. While there, I heard that sickening "thunk" sound as the transmission went into reverse. I ran around to the front to see my 5000 lb Ford going in reverse down a hill. I ran like hell trying to chase it (why, I don't know, just instinct, I guess). It went about a block, got up to about 40mph and nailed a mobile home at a 90 degree angle right in the middle. It was like a hot knife through butter. I'm stopping right here, because the image is just too painful to think about, even after 25 years.