sure, putting a piece of metal into a living thing full of electrolytes, and other into the ground will make a little power. Or take two different metals and put into plant or even better a very acidic fruit.
Works with humans too. Take someone you don't like very much and pound a brass spike into one hand and an iron nail into the other, hook up a voltmeter and watch the electricity. Well, maybe that last might not over so well in polite society.
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