...but with a funny side too:
Those are funny!
Years ago I had to run after my car, containing my eight year old nephew as it rolled down a hill outside my mothers house. It eventually sideswiped a wall taking most of the momentum out of the runaway. Turns out my nephew had let go of the handbrake to 'see what it did'. I always leave the car in gear when parked on hills now, and never leave kids in the car themselves!!