I’m pretty sure I never pooped at school. I was much older by the time I was able to do the deed in a not-my-own-house potty.
I’m not a shy pooper by any stretch of the imagination, but I never dropped a load in school (a few times in college, but I worked and went to school so most times I went at work.) I did witness on occation the occasional school pooper, and each and every time someone (usually a bully type) would scream as loud as possible that the whole room stunk and that there was a kid shitting in the stall. Once a bully (who actually happened to be a friend of mine) opened the stall door (the locks were the lift up kind, so all he had to do was reach in) and flushed the toilet the mortified pooper was sitting on. As he did this he yelled out something like, “Christ kid, you gotta at least give the rest of us a courtesy flush.”
I also pushed over a porta-potty (Don’s Johns as I recall) that contained a friend of mine who was so desperate to use a crapper that he actually trusted us to stand outside and wait. That was probably the most disgusting thing I ever witnessed (that is when the construction workers freed him from the porta-potty.) We pushed it over so that it fell on the door. When the big guys freed him he was covered in shit and was extremely pissed off. We, of course, had hightailed it out of there. He was so scared of infections and such that he went to the hospital still covered in shit. He was fine in the end though.