In 5th grade inside one of the boy's bathrooms, there was a giant turd in the middle of the floor nowhere near the toilets. It smelled pretty bad in there too, probably because of that turd. There was also poop smeared all over one of the stalls.
Other than that, there hasn't been anything really disgusting ever since.
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All through elementary school middle school and now high school there have been guys smearing their shit all over the walls. What the -blam!- is wrong with people I mean god damn there plenty of other retarded crap that happens to but nothing as retarded as that.