Sometimes it's just not necessary for you to take home a store receipt, as this one comically points out. The paper slip details the transaction, including that it involved the purchase of a donut. At the bottom of the receipt from the Freshest Donut Pros, there's a comical paragraph that details "I bought a donut and they gave me a receipt for the donut. I don't need a receipt fro the donut..." and so on.
Although keeping a receipt for your own spending records might be the only reason you choose to hold on to a donut receipt, as this note humorously observes: "I can't imagine a scenario that I would have to prove that I bought a donut."