I'm telling you this right off the bat, this video is not how you pull a prank on people. Asking random strangers to "Kiss My Ass" and getting mouthy with them will result in bad things happening to you, like this fool.
Before you watch, this is graphic and could turn your stomach. That being said, let's watch as "Kiss My Ass" goes wrong. (2:10 in will start the real payoff by the way.)