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a 12V relay with DPDT contacts, two capacitors, an automobile ignition coil, and a 12V battery would be a very simple zapper... first set of relay contacts would be NC contact goes to battery +, COM contact to relay coil+ and capacitor +. relay- and cap- go to battery -. other set of relay contacts, NC goes to battery+, NO to battery-, COM to second cap +. second cap- to ignition coil primary+, ign coil - to batt-. first capacitor is selected so that the relay cycles between 2 and 5 times per second, 2nd capacitor should be about 1 to 10uf and a low ESR type.
at the end of the movie, you find out it was Jim Duncan...
EDIT: sorry, i was thinking about High Plains Drifter, where he's asked several times what his name is, but never gives an answer. at the end the town sheriff is carving a name on what was an unmarked grave, and asks "I never did know your name...." and Clint Eastwood replies "you know it...", and then as he rides off, you see the name on the grave "Marshall Jim Duncan" but, yes, he never has a name in the spaghetti western trilogy.
A little piece of Brit triva...
It may not have made it as far as the USA, but there was a film called High Drains Pilferer, obviously a play on words.
It was a spin-off* from the Minder TV series with Arthur Daley et al.