The Most Embarrassed I've Ever Been At School

At school we have a group of older ladies known as "foster grandmothers".  Basically, they each spend a 6-week period with a room before moving on to another room, meaning each teacher usually gets a grandmother for one 6-week period a school year.  These grandmothers are essentially volunteers, so it's nice having them around because most of them really care about the kids.  That being said, these ladies are also quite old, mostly in their 70's and 80's, so they're often limited on what they can do with the children.  Anyway, I bring up the grandmothers to bring up the time that I was most embarrassed while at school.  I needed to use the restroom pretty bad, so I went into the teacher's lounge.  Our single bathroom in the lounge has a sign on it that flips.  One side says "occupied", the other says "unoccupied".  When I arrived to the door, the sign read "unoccupied".  I could also tell the light was off in the restroom because it wasn't shining under the crack at the floor.  Even so, as is my habit, I knocked loudly, which got no response.  Finally, I opened the door to go pee, and there sitting on the pot, WIPING HERSELF as I walked in was the oldest of our foster grandmothers.  It would've been embarrassing enough just to walk in on her on the pot, but to catch her at full wipe... that was terrible.  So, let me lay this out for you: the sign said the bathroom was empty, the light was off, nobody answered the knock, the door was unlocked, and all of this added up to me walking in on a little old lady taking a crap.  Not one of my favorite school memories, to say the least.