Not at any workplace of mine but at school. We had a substitute teacher for a day in I think in our sophomore year. Teachers save the easy teaching sessions for when they can’t show up, which means all a substitute teacher has to do is occupy the class with a documentary or something from the handy dandy wheeled video projector and make sure everyone behaves. However, she got a substitute who didn’t understand a word in English. And again, doesn’t really seem like a problem if you’re just there to hit a few buttons. But she got us a documentary with, well, let’s just say wildly inaccurate closed captions that looked ripped from a 50 Shades of Grey AI crossover fanfiction.