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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When the ghetto school in the city next to my town got closed a bunch of black and burmese students came out to my school. Every -blam!-ing week since those dumb shits came to my school some -blam!-ing asshole smeared shit on the walls and mirror!