There’re mandatory fire drills in the building I work in, but 100% of the time they’re before I even get to work. I’ve never participated in one ever before. Closest I’ve ever come was when the fire marshal guy makes an announcement from the fire alarm that they’re testing it and that we don’t have to evacuate. Usually though, it sounds more like a subway announcement filtered through a voice distorter through a telephone through a drive-thru window box. Safe.