When you go through the drive-through, the attendant doesn't hand you the debit/credit machine and instead takes your card and taps it, and doesn't give you a receipt. Then he/she give you the
face when you ask for a receipt.
If you're not going to let me see how much I'm paying, you're giving me a receipt to show me how much I got charged. Sorry if I'm supposed to assume some stranger working for minimum wage isn't capable of making a mistake or doing something shady.