Not sure if everyone played this game, but growing up Two for Flinching was one we played often. The idea of the game is to get your opponent to flinch by faking a punch. If they flinched, you gave them two hits to the shoulder. The only way to stop the game was to become so poised that when your opponent would try to get you to flinch you would just stand there looking them in the eye as to say, “What else you got? I’m not moving.” If you mastered the resistance by not flinching, you gave them two hits instead.