LOL! A couple of years ago the music teacher and I had a class of 2nd graders believing that there was a former student living up in the ceiling (we'd put him there for being bad ). Out of nowhere there were sounds and voices coming from the PA system. But usually when the PA system is being used there is a tone that sounds right before anyone starts speaking. Plus, this "person" was saying "woooo" and sounded like a child. We named the "kid" Jeffrey. We, of course, told them the truth, but to this day if anything weird happens they say "It's Jeffrey!" LOL!