Occurred on July 13, 2017 / Los Angeles, California, USA
Info from Licensor: "I was riding the Metro Blue Line in Los Angeles. This guy started singing loudly and badly. By the time I busted out my camera to record his singing, he started yelling at another guy. Then he went over and snatched the guy's sunglasses off his head and backhanded slapped him. This scared a lot of passengers, and someone tried to call for help on the intercom, but it was too late and the guy exited the train."