TIFU by accidentally showing porn to my 11 year old student.
I work (or worked after today) in a small school, teaching English, I only have one student every class, and I have a lot of freedom regarding what we do in class. So, for children's day I wanted to make something special, we were going to watch Shrek, I opened my favorite website to watch it online, and a porn pop-up appeared on the screen. I turned it quickly, but he saw it, and he told his mom.
He also told his mom about the times when we play board games in class (not all class, not all classes) and the fact that the movie wasn't even in English.
So now his mom thinks all we do in class is play, chitchat with the other teachers and watch porn.
TL;DR: take your job seriously, don't play board games in class, don't watch shrek, and for the love of god, do not enter any piracy sites with children around.