Back in the 70's in the Aldine School district they had a knockout game by
walking up behind another student and headbutting the back of their head.
Until someone got their neck broken and the Coaches stepped in because it was the
Football teams who were doing it, only Black players were doing it. It started
as a harmless helmet to helmet butt on the field but bled into the hallways of the schools.
Back then corporal punishment was legal and used very effectively by the VP and Coaches.
In most cases the Coach and VP would demand the mother come watch the punishment or risk
having their star player kicked off the team. Sometimes both parents.
I have no idea where this new way came from. It had to start somewhere.