I bought a doughnut and they gave me a receipt for the doughnut. I don't need a receipt for the doughnut. I'll just give you the money, and you give me the doughnut, end of transaction. We don't need to bring ink and paper into this. I just can't imagine a scenario where I would have to prove that I bought a doughnut. Some skeptical friend: "Don't even act like I didn't get that doughnut! I got the documentation right here...oh, wait it's at home...in the file...under "D", for "doughnut."
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