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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I had to go to the bathroom and the closest one was near the cafeteria which is one of the worst bathrooms. I went into a stall and there was a juice box in the toilet with dark yellow piss. I figured that if I flushed the toilet it would just flush with it. Nope. Piss water squirted out and got all over me.