I was unaware this was going around until my parents notified me (they worry because of my frequent travel). A few YouTube searches later and it's clear the media isn't reporting this much. It appears to be happening in major cities, but some reports have it spreading much wider. The 'game' is played by an attacker finding an unsuspecting victim and hitting them, the ideal scenario being one hit knocks them out. One of the videos I found showed it had spread to London also: Have you heard about this yet? From what I gather, targets are people who are usually walking alone. Victims so far have been both male and female (this guy died from his attack). Attackers are sometimes within a group, or as seen in the first video, acting alone.