OK, I have one:
I'm teaching AP Biology to an advanced class. I start showing them chemical diagrams and they start yawning... So I whip out a few interesting drugs like nootropics. I then go on to explain some other drugs that are bad for them like nicotine, alcohol, etc. Finally, I run out of room and erase the board, start over with "Marijuana", "Methamphetamines", etc.
In walks the director for a surprise evaluation and all he sees is drugs all over the board. Yes of course I had the Thai transliterations so he knew what was going on.
I didn't get fired though. Carry on private.
Oh I did the zipper down too my first day teaching in Thailand. Coincidentally the students all sit at a level where their eyes meet my zipper so of course they noticed and asked me to zip up.
Fortunately I was wearing underwear that day...
