...that sounds seriously pervy man. T_T
That's so traumatising I don't even really know what you're actually talking about there.
It got worse, actually.
The way the toilets were built, they didn't have closing toilet doors. You could pretty much look into either gender's toilets from outside. And if you were in the cubicle nearest the doorway someone standing at the opposite door would also be able to look into your cubicle if you open that cubicle door.
So, yeah. A possibly unisex group of about six to eight plus kids between the ages of five and eleven gawking at your underpants region and worse, TRYING TO SEE IT AGAIN EVERY SCHOOL DAY FOR THE NEXT YEAR sure ain't a fun experience.
Luckily, it never happened twice. I had to spend every toilet visit with my jacket draped over my bare ass and with both feet pushing against the door even though it was locked. They ALWAYS tried to pick it open again anyway, though.
Sometimes they'd unlock and then gang rush the door. But because at the time I was swimming almost daily I had the leg strength to hold 'em back long enough to throw the lock back on again and delay them until I could pull my pants back up and open the door myself.