I was just told a very funny story from a friend of my cousin. The event takes place a couple of years ago, when this friend was a little girl.
She was asked to help the neighbour, an old grumpy woman. She had to mow the lawn. After a full day of work, she was called inside the house, and the old woman told her that she would receive something for the assistance. The old lady then opened a box of chocolate, where one piece was left. The old lady ate the choclate and said: „This beautiful box is for you, you can keep it.“
Of course the little girl was very angry.
If you ever mow the garden of an grumpy old woman, negotiate about the payment before you start working!