Answer provided by Dr.Science: Whenever one falls off a car that is moving, it's a shocking experience. How well I remember the time I hung onto the side of a Volkswagen beetle going down the highway. It was the summer of my fifteenth year, and I was standing on the running board, holding onto the metallic lip of the rain gutter on top of the door. Everything was fine until we rounded a curve. Then centrifugal force pried my fingers from the gutter and sent me onto the road's surface. At first, nothing happened. Then, it was as I had been kicked in the behind by an invisible boot of centrifugal force, for I began to tumble head over heels down the highway. That was so shocking I spent a few days in bed, trying to grow new skin. Last time I checked, the laws of physics apply in England as well, although I imagine if you were foolish enough to repeat my experiment you'd be tumbling down a different side of the highway.