My uncle was a school janitor for a long, long time. He had a problem with the boys - all about that age, 10,11,12 - peeing on the radiator in the bathroom. Probably made an interesting sizzling sound, or something.
His solution? He borrowed some of my Aunt's nail polish and put a dot on the back of each urinal. Kids had something to aim at, problem solved.
In this day and age, I'd just put up a camera in the gym and figure out who the phantom pooper was.
“His solution? He borrowed some of my Aunt’s nail polish ...”
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Meh. My solution? I would’ve live wired that radiator.
(insert evil laugh here)