Saw a turn like this in the toilet at school in 2nd grade and I’ll never forget it

I once opened a portapotty at a local sporting event to see a literal mountain of shit rising from the cistern/tank it all goes into that came to a peak about 2 or 3 inches above the seat. I am, to this day, confounded as to how and more importantly why the last few poopers actually managed to get the shit that high without sitting directly on the mound.