My first so it wouldn't be good, translation check please. :3

Haha, we play something similar to this all the time in school. We hold each other's hand like a handshake, and play rock paper scissors with the other, everytime someone loses, the other gives a hard slap on the opponent's hand they're holding. And we just keep going until one backs out.

I remember something like that. But we called it ja-ken-po

In my school we just skipped the bullshit. Grab hands like arm wrestling, and take turns slapping to see who gives out first.

The other one was hold out fists and take turns punching each others fist until someone gives up.

In retrospect, some of these games I played as a kid were pretty weird.

^ makes you feel nostalgic...