Chokeout game was everywhere.
We never did the suckerpunch thing, but "dead legs" where you kneed someone and give them a charlie horse was huge. We only did it to people that "played", but as a big dude that's nervous to punch someone in a real confrontation...
I've ended a lot of fights by giving a dead leg and walking away. No one ever sees it coming, and even if they stand back up they ain't chasing anyone down. There's no permanent damage and they'll be fine in a couple days, but knocking someone out and they fall wrong could be lethal. Plus, everyone is still ready to fight after getting knocked out. Losing the use of a leg is just confusing and takes the fight out of people.
I'm really surprised it's not one of those things they teach in women's self defense, it takes almost no effort if you can hit the right place reliably.