An elderly woman visited a store that sold jade and requested seven kilograms of potatoes. The owner was delighted to help and started packing the potatoes. However, the woman stopped him and requested that each potato be wrapped individually. The man complied and asked if there was anything else he could help with. The woman then requested four kilograms of onions to be wrapped in a similar manner. The shop owner packed the onions and asked if there was anything else. The woman requested seven kilograms of carrots. "Let me guess," said the owner with a sour face, "you want them wrapped individually." "Oh, that would be grand." she said. The shop owner fulfilled her request and packed all her items in a bag. The woman then asked: "What are in those crates behind you?" The man flushed red and said "Madam, these are grapes and they are not for sale!"