Besides the obvious plethora of strange smells what is something weird or an unusual situation you have encountered in a public bathroom? Being a male I can only go by what my wife has told me of the nastiness she encounters in the women's bathroom. I have 4 that stand out for me.
1. I worked with a guy who had to completely disrobe to drop a deuce. If you walked into the bathroom all of his clothes would be folded neatly on top of his shoes. He would have his bare feet on paper towels or seat barriers.
2. Several times I have ran into people having sex and or doing hard drugs like Cocaine and Heroin.
3. Going to the bathroom in Turkey and finding just a hole in the ground with little foot cut outs in the floor. Growing up in the mountains of Virginia and using an outhouse until I was 5 this one really didn't bother me.
4. Hearing someone eating while taking a dump. You could hear the fast food paper making noise and the guy chewing and swallowing as well as using a straw to drink from. .