In a bucket placed in a cupboard adjacent to my classroom because the teacher disallowed going to the lavatories and I was only 13 at the time.
Because it was dark, I kicked the bucket over.
I was given a months detention, made to mop up the mess with my hair, had to apologise to the teacher and pupils for being so disgusting, confessed to my priest (who wanted me to personally demonstrate again what I had done), got thrashed by my mom with a broom handle, had to wear a label pinned to my back saying 'I am unclean' for six months, made to write a public apology posted in my local newspaper, went to Pee-Right rehab' correctional facility who then forced me to wear incontinence pants for a two years.
Strangely, I now have a picture of my teacher stuck to the bottom of my toilet bowl ( I live alone), but I ain't bitter about it.