Does this really happen?? I guess I've lived a blessed life.
On a weekend retreat in high school (we'd go upstate and talk about God and Jesus and stuff), a few dozen of my classmates and I conducted a "group poop" where every stall in the boy's room was shat in, and then a second line of guys would excrement on the previous excrement. Thankfully I was in the first line.
Then someone got a young math teacher to go in there. We hovered around the door, listening, heard "...AAAAAAAUUUUUUUUGH!" and scattered, laughing.