Ha. When I was in high school, I started my illustrious DJ and musical career. We started a h.s. closed-circuit radio station with the help of the school a/v guy. Maintenance hung some speakers in the cafeteria, and they seemed pretty solidly mounted; chains and everything... Until one day, don't know what we were playing... Something with significant low end to rattle one of those boys out-of-place. I don't know, but that speaker went flying and did the "pit and the pendulum" thing, and thankfully, mercifully, miraculously didn't take someone's head off, but it was really close...
GJ