....mmm...yes....lol...I like it.........incidentally it has a present day counterpart..........the latest in the war on antisocial behaviour is to play high pitched sound wherever "yobs" gather to "enjoy" themselves as they do.........apparently only people under, 19-20 or so can hear this and it hurts so much, as did your teacher's gauntlet, that they just have to go elsewhere. Anyone older can't hear a thing.
Trouble is that the poor little dears have to be protected from such terrible things and the threat of prosecution is rearing it's ugly head to have it stopped. I suspect that your teacher would similarly have had to give up what she did as it would be deemed to be both dangerous and an infringement of their Civil Rights............commoner
The good news...
I hear they are bring out a Mk2 version, which also destroys the teen-agers as well...


You can get them in the Argos Stores...