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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1. We had what we called the Serial Pooper. Ever morning for a couple weeks he'd poop in odd places like urinals and the scales in the weightlifting room. 2. The special needs teacher was fired for sexually abusing some of his female students. 3. One of the gym teachers was fired for asking a 16 year old student for oral sex. 4. Some couple was caught fingering in the hallways during the lunch break. 5. As a senior prank the class that graduated before I became a freshman stuffed random lockers with roadkill and air vents. School started 2 weeks late because they had to make sure the school was clear and they had to pay a cleaning service to disinfect everything. I went to a very small high school of about 600 students from the surrounding 20 mile area too.