Me, it was in middle school, and all the girls were called down for an assembly. After asking around afterwards, turns out this one girl had her period in the bathroom, so there was a ton of blood on the floor. Then, the girl smeared the blood all over the wall. The thought of it is disgusting.
You, flood?
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Somehow someone's shit ended up on the wall and the bathroom door. This happened 3 times. No one knows who did it to this day.