Mine was when I was at school:
Messing about on the old PE wooden benches and I got a splinter in my arse cheek. Went to see if I could get it out in the loos but failed so had to pluck up the courage to go and see the school nurse. She had a poke about with a needle etc but couldn’t get it out either so went and got one of the other nurses. She also failed. I think I ended up with a couple of nurses, a secretary and the head of 6th form all peering at my arse bent over the nurse’s sink but all to no avail.
Had to spend the rest of the day sitting on the unaffected cheek before heading to A+E and having to explain the whole affair all over again. Eventually, I had a local anaesthetic and offending article cut out. Turned out to be 1.5 inches long and broken into two pieces so no wonder the school nurse struggled.
An awful lot of people saw my bare bum that day which as a 13 year old boy (not at a private school) was pretty embarrassing.