I remember that fire drill crap when I was in elementary school. I had a huge fear of them. If I was informed or even suspected that there was gonna be a fire drill, I started having an anxiety attack. I was the weird kid who sat in class covering my ears because I was anticipating the alarm going off at any moment.
My upper elementary school had the same fire drill except it was a higher pitch, so high that it was so annoying! Im a 7th grader in middle school. Usually on a day we had a fire drill, the principal would tell us on the PA system, but one time when I was in elementary school, the fire drill went off without the principal telling us so.