There's a video online of a road rage incident where a guy knocks himself over with his own car, because he forgets to put it in "PARK" before he gets out. He opens the door and goes to confront the driver behind him, and the car rolls backward and knocks him over. He's lucky . . . he only got hit by the door, but he easily could have gone under the wheel. In this clip he falls under the door right before you hear the bang of his car crashing into the one behind it.
WARNING: The video has uncensored profanity.