Hearing you loud and clear

I once worked in a secondary school that had a Hearing Impaired Unit (HIU). There were approximately a dozen pupils in the unit and they were taught in classes with the other pupils. Due to their hearing difficulties you had to wear a transmitter around your neck, when teaching a class with one or more pupils from the HIU. You had to be careful when teaching with a transmitter as the HIU pupils could hear your every word, and if you ever shouted at someone they would have to turn their receiver off that was in their ear. These devices were very clever and could pick up your voice even if you stepped out of the room.
On a Friday afternoon we used to have a whole school assembly in the main school hall, about 700 staff and pupils. Whoever took the assembly had to wear a transmitter so that the HIU pupils could hear what you were saying, wherever they were sat in the hall. One particularly warm Friday in the summer term we had a VIP taking the assembly, the Mayor of the local town. When he was speaking in the hall he looked very grand wearing all the layers and the chain that Mayor’s wear.                            On completing his very prim and proper speech he received a huge round of applause from the whole school and left the stage. He was then taken to a nearby classroom to disrobe and proceeded to curse and swear about what a Mayor had to wear on such a hot day. This included blurting out several expletives that young people should never hear. Meanwhile, back in the hall the assembly continued with all the HIU pupils, wherever they were sat, giggling out loud as they listened to their very prim and proper Mayor swear and curse, and all the time he was none the wiser. By the end of the assembly the HIU support staff had told the rest of us staff what had happened, and it certainly made our day.