wpix reporter arthur chin has details. >> reporter: as sick a game as it is, police are investigating yet another case, possibly inspired by what's called knockout. a 24-year-old jewish man was the latest victim passing this deli on the way home. overheard four discussing the game, then one stepped up to him, tried to punch him. >> when you highlight an incident or type of criminal activity, some people will simply try to copy it. so, you know, it's a phenomena we've seen before. >> reporter: the victim was able to get away, police shortly arrested all four suspects, unlike other cases, showing the stunning knockout, the community gets the picture and they're worried. >> if we allow this kind of behavior to continue, we're going to have chaos. the idea to attack someone for no reason on the streets of new york city is something that's outrageous. >> reporter: the suspects, mail