Re: A static story from the ether.
In 1972 I was on a youth training course learning GlassFibre boatbuilding. We had an order for a 44ft hull so its mould needed to be brought from storage into the working area. The mould was supported by a wooden structure braced by scaffold poles and had two axles which steered making it easy to move around. It was hooked up to a car and the first attempt to move it failed. I could see that a heavy chain attached to the keel was trapped under something and rather than free it I disconnected the chain from the mould. Once free we got the mould out and into the workshop. A gantry ladder was brought over and I climbed up and lowered the middle ladder into the mould so I could climb into it.
I was given a tin of wax and a load of polishing cloths. Shoes would scratch the surface and socks were too slippery so I went in barefoot. Starting up front I waxed a two foot square area and polished it then moved along a bit. Wax and polish, wax and polish. About five hours later I was done. I called for the ladder and it was brought over. One guy held the gantry while another climbed up and lowered the middle ladder. I went to hand him the cloths and tin of wax but there was a huge spark between the tin and the ladder accompanied by a deafening bang.
I ended up on my back and the guy holding the gantry was writhing around on the ground in a fit. The one on the gantry didn't feel a thing. An ambulance was called and we went to hospital. I was fairly sweaty so all I had was burns to both heels plus track marks up my legs and back and down my right arm. My collegue was kept in overnight and was off work for a week.
That chain I removed was the earth, designed to prevent static buildup. I didn't know this and nobody else checked it either. 1970s health and safety - didn't exist.