Imagine you're in Starbucks buying your café latte. As you hand over your coins, the barista tells you the money you're giving him is unacceptable. What do you do? You might politely point out that your coins are universally exchangeable, and thus he is a fool to refuse your attempted payment. If that fails, you might resort to some good old-fashioned Anglo-Saxon phraseology. If you're in a particularly aggressive mood, you might lean across the counter, grab the barista by his apron strings and nut him.
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