A few years ago, my friends moved to Israel, to Tel Aviv.

Once they went to a local supermarket with the desire to buy something for a quick snack for lunch. They were in a hurry, but in front of them was a lovely grandfather at the only working box, to whom the cashier pierced each item separately, and paid for it.

When finally their turn came, they asked the cashier what the gentleman’s behavior was related to. It turns out that this is their regular customer, and he always does so that the amount is rounded in his favor for every purchase, not for everything at once.