Where are all the electrical experts?

OK. Probably DC. One hand was touching a positive connected surface, the other was touching a negative connected surface.

Please note that 'earth' is irrelevant here. There is no natural potential difference between between 'mother earth' and a feed (terminal) unless the other feed has been deliberately connected to mother earth somewhere along the line . . . as in domestic AC installations.

In DC it is common for negative to be connected to the engine block . . . saves wires . . . and if your block is insulated from your 'leg', you need to ask the question, is the leg positive relative to the block/wet hull? (get that VA meter out!) and if so, why? Where's the connection?
 
If the weather is cold and dry, it could be static generated by lifting the boat out? Just a thought - has anybody ever found this, or is it just a dumb theory?
 
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If the weather is cold and dry, it could be static generated by lifting the boat out? Just a thought - has anybody ever found this, or is it just a dumb theory?

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If it had been static I would think it would dissipate the instant I touched it. The boat had been in the slings for about an hour, had been pressure washed then put down on two planks so it was not even touching the ground. I got a tingle when I touched the line cutter behind the prop, then when I had taken off the prop I got further tingles through the screwdriver, it’s one with a metal blade that goes right through the handle, from the screws holding on the anode,
 
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