I collected lots of little lost scraps and notes when I worked with school-age kids back in the day. Here’s one I re-found in the archives (aka “insurmountable piles of crap”)
The genius lies in the simplicity. What I enjoy the most are the three (3) wavy lines, which serve two purposes: not only do they convey the action of pooing, they also represent concentrated stinkiness. This shows the artist’s attention to detail while not getting caught up in the minutiae of, say, clothing, fingers, or a toilet.