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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My friends told me about this prank that some kids pulled on another. These kids always have lunch together and usually share food. I guess they hated one kid, so morning when they made their lunches they came on to a piece of bread, spread it, and made it into a sandwhich.they got to lunch and offered that kid they hated the sandwhich and he ate it. the kids were expelled.