It was most pupils in my classes. Kids got kudos for having fancier/louder chimes than others. Then came the rush of calculator watches, so everyone started get

It was most pupils in my classes. Kids got kudos for having fancier/louder chimes than others. Then came the rush of calculator watches, so everyone started getting watches confiscated before exams, and that other teacher's favourite: the TV Remote watch. Our school admistered masking tape and/or TipEx over the IR receivers to tackle this.