Variations on this story have been around for at least 27 years that I know of. Everyone says it's a hoax, including Snopes.
But... just because there are no 'known' incidents (documented, notarized, published by newspaper or eyewitness videos) doesn't mean it hasn't happened. And even if it hasn't happened, there's no law that it couldn't happen. Besides, there are enough stupid people that if it hasn't happened, it's just because of dumb luck more than anything else. It's just another form of carjacking, isn't it?
Sue