When I was 13 in the 8th grade, the bathrooms at my school were surprisingly clean. I had to make a bowel movement one day in Algebra class and told the teacher I was going to the bathroom.
When I got to the john I saw that nobody was there and I decided to do something thrilling and stupid, hoping another guy would walk in.
I pulled my pants down and took a shit right in front of the urinals, beside the stalls. I wiped my ass and put the tissue in the toilet, though. I was laughing on the way back to class, glad nobody else came in the bathroom.
After class, I told my friend to look at the shit somebody took on the floor. He said it was gross and the other guys in the john thought so too, trying not to step on it and someboby called a janitor. I never told anybody my little secret for 5 years.