A man always bought oranges from a woman at the town market. She would weigh them on a scale and place them in a bag and tell him the price. After he paid, the man usually took one orange out of the bag, peeled it, and tasted one piece. Then he’d say, “This orange is sour,” and hand it back to the woman.

She would then bite into it. “It tastes sweet to me,” she always said, but she gave him a few extra oranges to make up for it. 

The man’s wife went to the market with him every day and saw this happen time after time. One day she asked her husband, “Why do you do that every time? The oranges are always sweet.”