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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Bumparuni. Also, one time a kid collected all of the spinach from all of the kids in the lunchroom and ate it til he puked in Language Arts.