“Knockout game” is one of the names given in the United States for assaults in which a person (with others acting as accomplices or lookouts) attempts to make an unsuspecting victim lose consciousness with a single sucker punch.
https://en.m.wikipedia.org/wiki/Knockout_game
The knockout game, it happened to a good friend of mine. He was working in a large city (by choice), and was going home at the end of the day. It was around 5 PM. There was still some daylight left.
He made the mistake of taking a shortcut through an alley to get to his car. Bang! Some kid ran up behind him, and knocked him out with one punch to the side of the head. The kid was never caught (of course).
My friend was lucky. He only spent a couple of days in the hospital.
I’m not blaming the victim, but he made two mistakes.
Mistake #2 was going through that alley.
Mistake #1 was working in a large, Democrat-controlled city.