I got this wonderful little box as a heritage from my past grandma and I sertainly had proper use for it.
This device was build by my father with his brother somewhat half a century ago. It is a sort of transformer, made to prank peole with electric shocks. Though with my brothers and friends we took it as a hobby to make a circle holding hands and get some high voltage shocks out of it.
That plastic container in the middle came from a juice bottle and I installed it almost fifteen years ago to keep this thing together. I wasn't too satisfied to it even then, but had nothing better in my hands.
Now these lovely items came to help, a frame of a coffee grinder and a switch.
This old pump offered its hand(les).
And here it is,
a box full of suprise!