So here is a little story about paying it forward:
An older gentleman, at the order board at the drive through. Impatient woman in the car behind him leans on the horn, to hurry him along.
He is a little annoyed at her rudeness, but at the pay window, he offers to pay for her order, as well as his own.
As she gets to the pay window, she is informed that he payed. She gives a friendly toot on the horn to him, and waves, cheerfully.
He waves back.
When he gets to the pick up window, he picks up her order as well as his, after all, he does have the receipt.
As he drives away, he takes great comfort in having rewarded her rude impatience with the gift to her of one more spin through the drive through.