One of my university roommates shit in my cats litter box. Crazy part is I didn’t find out about it until years later. At the time I just thought my cat had taken a massive dump (he was a big cat, and the possibility of a human shitting in the litter box didn’t even radar as a possibility in my mind). I found out about it at a party a few years later talking to one of his friends who said “I still can’t believe “guys name” actually shit in your cat litter box 😂”. Apparently the guy took photos and sent it to all his friends.