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 saw 3 people get stabbed back in high school, all 3 tmes it was a fight over a woman who was cheating or something, and one almost always pulled a knife, one kid was crippled because the other stabbed inbetween to spine bones and severed the nerves... it was an extremely lucky shot, another was stabbed in the throat, there was a lot of blood, and the guy was in critical condition.