Fair warning - this video is disturbing. If you watch closely, the kid at the beginning of the video is trying to open his car door to hit someone riding a bike with it. As the title of this post indicates, sometimes karma involves graphic violence. Having been threatened by more than my fair share of drivers while riding, I can't honestly say that I didn't wish this kind of thing would have happened to them.
You can stop the video after the first slo-mo repeat if you want to (and you'll probably want to).