I Don't Need A Receipt For A

I Don't Need A Receipt For A 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 Can't Imagine A Scenario Where I'd Have To Prove That I Bought A Doughnut. Some Skeptical Friend...'don't Even Act Like I Didn't Buy That Doughnut! I've Got The Documentation Right Here! Oh, Wait, It's Back Home, In The File. Under D...for Doughnut.'