Acme fuse blower

A story recounted by, I think, my old Chemistry teacher, Mr Croker, concerns a device comprising a metal box with handle, containing a quantity of steel plate to make it heavy; a flexible cable; a plug with the fuse replaced with a length of nail; and a button which shorted the live and neutral of the flex. The box was labelled "Acme Fuse Blower" and the switch had a label "press here to blow fuse".

Apparently he used to leave this lying around at parties (presumably at other people's houses), with the inevitable result.

These days it would be easier and safer, just trip the RCD.

Reminiscent, too, of the etherkiller, logo of the scary devil monastery.