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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I was in 5th grade and had diarehea so I took my underwear off and let it behind a toilet. (This was on the last day of school too.)