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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This isn't disgusting at all but one year I had to pee in a cup like 4 or 5 different times for a drug test all in the same year.