An older couple went to dinner at a trendy restaurant that had no printed menus--just a scannable QR code to see the menu on your phone.

After much grumbling about new-fangled things, they ordered a light dinner and afterward the waiter delivered the check.

When the waiter came back for payment, the husband displayed his phone to the waiter showing an image of a $100 bill.

"Here. You can keep the change."