"I bought a donut, and they gave me a reciept. There is no need for that, man. I’ll just give you the money, you give me the donut. We do not need to bring ink and paper into this. I cannot imagine a situation in which I would have to prove I bought a donut. Some skeptical friend: “Hey man! Don’t even act like I didn’t buy that donut. I got the documentation right here…damn…I forgot it at home…it’s in the filing cabinet…under D…for donut” -Mitch Hedberg