In Japan, there is a prank children do called "Kancho" where they put two fingers together and surprise someone by pushing it up against their anus through their pants
in Australia, while not an overly common thing, I have a few friends who, when someone sits on their lap, they put their hand in a "thumbs up" position in their lap so that the thumb goes up the arse
@Australian-Person They teach it among themselves. Parents could try to tell them not to, but since they also did it when they were kids, so they see it as normal, and telling a kid not to do something is one of the fastests and surefire ways to have a lot of them do it...
@Australian-Person I think you are wrongly considering an upvote here to be a mark of approval of the action, when normally it's a mark that the card is interesting in an "oh I didn't know that" kind of way.
When i was in third grade, we used to prank each other with that method (Not naked of course), and we called it "Naruto" i can't quite remember why we called it that, but we just did (:
'@JoachimTheCross'
Going off vague memory I think they did this prank in the Naruto comic/anime, so looks like you and your friends were being erudite cultured young men, partaking in cross cultural exchange, of sticking your fingers up eachothers butts
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