When I was little I played pranks with my friends – little things to make each other giggle or groan or make us pay attention to each other. One of our classics was unzipping each others jackets when the other wasn’t paying attention. It would usually elicit a mock indignant yelp, some laughs and a promise of “payback” in the form of the instigator’s jacket being unzipped next time.
I was in grade school, maybe eight years old. It has been decades since that game stopped being amusing.