I once used my own underpants. And flushed them.
I was 15 or so. It was at school, I had diarrhoea and the teacher refused to let me go.
After a while I just ran out, got to the toilet, no paper, **** that. Used my underpants, figured what I'd do with them, decided to flush them just to punish the school for hiring that **** of a teacher. Hell yeah.
I also once peed in my mom's shoes. I was... less than two years old I guess. We were out walking in a forest and I had to pee. My mom had to aim for me back then and she didn't know the golden (...) rule; Do NOT piss against the wind. So that's what she did and hit her own shoes. She didn't notice at first so they were thouroughly soaked