I bought a donut and the guy gave me a recieipt for the donut. I don't need a receipt for the donut, I give you the money, you give me the donut, end of transaction. We do not need to bring ink and paper into this. I can not imagine the senerio where I would have to prove that I bought a donut. Some skeptical friend. Don't even act like I didn't get that donut. I got the documentation right here.
In the file. Under D.

A bananna is like a stop light. On a stop light, green means go, yellow means slow down and red means stop. On a bannana, green means slow down, yellow means go and red means...
where'd the fuck you get that bananna?I reccomend not seeing my doctor who drew my blood yesterday. His name was Dr. Acula.
PS, this is what the alphabet would look like if QR was excluded.