I worked in a grocery store as a teen, and we always fooled around with the PA system after hours. It’s what they’re made for, isn’t it??
When I was a factory foreman we had a bunch of ex cons from a halfway house working in the shop. I used to page them by their prison numbers.
Well, I do recall a certain fourth-grader who was called into the Principals office. While waiting for Mrs. DeVries to return this self-same fourth-grader picked up the handset and started singing (I can’t get no) Satisfaction (which happened to be in current rotation at the time).
That fourth-grader didn’t know that the mic was live and being carried to every classroom in the school. Man, did that take a long time to live down!