I have a few.
Aside from our school resource officer, our high school had a few "security guards." Most were older retirees, including a Marine who one day shit his pants while on the job.
A few of us guys were in the bathroom during our lunch period, and someone pointed out that the security guard in question was in one of the stalls. We could tell it was him because his ID badge was clipped to his belt, which was easily visible from below the stall door.
Next, we noticed the security guard remove his shoes, followed by his pants and underpants...which we could clearly tell were soiled. By this point, we were laughing our asses off - the security guard was oblivious to this because the hand dryer was running, and it was loud enough to drown out the laughter.
We then returned to the cafeteria, and once we saw the guard exit the stall, two guys went back into the bathroom to find evidence of the pants-shitting. Sure enough, they found the dirty underwear in the trash can, and one of them took a picture of it with the camera on his flip phone. Mind you, this was back in 2005.
News of the pants shitting spread like wildfire, which one of the guys who witnessed the shitting played a key role in. We had concert band practice right after lunch, and the music teacher was a cool guy who'd occasionally kick off practice by sharing a funny story. Sure enough, one of us stepped up and shared the story with the 60 or so kids in attendance without missing any details. Unfortunately, the guard eventually found out when some faggot who was obsessed with the Marines told him.
I may share some more. The football coach's sex tape coming out is a good one, too.