Small anecdote from my life, today.
Arthur tried (stubbornly) to try to pay the previous customer’s groceries, at the checkout at the grocery store today. He simply wasn’t receiving the communication from me, from the previous customer, and from the cashier that it wasn’t his “turn” to pay – we were next in line, the previous customer was still finishing checking out of the store, but Arthur was ready to pay, now. He was left bewildered and confused when we told him to stop trying to pay. I had to take his credit card out of his hand.