I used to have a 4lb hammer that had it’s wooden handle smashed to bits and a piece of steel pipe welded to the head as an improvised replacement,
I ended up taking the adjustment thimble off a buggered micrometer and fitting it to the end of the hammer’s handle.
Whenever I would work with someone new, I’d make sure I had their full attention and make a great show of putting on my reading glasses and with much care and precision, adjust the micrometer settings of the hammer, before wildly belting the living bejesus out of something.
I would enjoy the puzzled looks on their faces until they realised that I was having them on…..some took a lot longer than others to figure out what I was up to.
A good way to evaluate a newcomer to see if they had a sense of humour, any sense at all or if they were just as dumb as dog shit!