(I have to change my schedule at the beginning of the school year. The class I end up with is PE, so I get into our PE uniform only to find out they are at the swimming pool.)
Male Teacher: “What do you think you’re doing? Get back into the locker room and change into your swim wear!”
Me: “Sorry. I just got transferred into this class. I wasn’t informed that you were in the middle of swim. My last teacher was doing tennis.”
Male Teacher: “Fine, but bring your towel and swim wear tomorrow. You are swimming! Now walk around the pool the rest of class.”
(Unfortunately, the next morning I start my period and I am unable to use tampons at that time, so I once again come to class in my uniform.)
Male Teacher: “[My name], didn’t I tell you to bring your suit!?”
Me: *embarrassed* “I’m sorry, sir. I… um… I can’t swim today. Or for the next week.”
Male Teacher: “And why not?! Jesus, all you girls are the same. Always refusing to swim! You will be swimming today!”
Me: “Sir! I can’t swim! I can’t use… tampons. So unless you want to bio-hazard the pool, I suggest I walk the track for the week.”
(He turns bright red, apologizes about the whole ordeal, and explains he isn’t married and forgets that girls have a monthly cycle. For the rest of the semester, he never asked for an explanation when a female student said they couldn’t swim.)