I have a laser engraving machine at work that houses a class 3 fiber laser. The amount of people that lose their shit when you open the door to add/remove parts or straight up walk 50ft around the thing is insane. All because of a little sticker that says "Caution- Laser Radiation". They seem to think it's a reactor core or something. No matter how many times I've explained the difference between ionizing and non-ionizing radiation, and showed them the data sheet and safety interlocks, I get the same one line argument "It says radiation. It's gonna give everyone here cancer."
I've thought about it, but decided it's probably not worth getting sent to HR over. Chances are they'd be just as clueless and wouldn't find the joke very funny. Would be hilarious to watch the chaos unfold though.