I took a quick scribble while waiting my turn and a photo to finish it at home.

This is an old birthday gift/joke. Heavy metal in this case: several hundred million dB of sound power, broken glasses, neighbor panic... My 11 y.o. used to ring it some time ago, preferably while I was drawing in 7th heaven so he could wake up my darkest, primitive and deeply hidden myself... just for a few seconds, lucky him.
It's been placed for some years on an upper shelf.