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White hairs
One day, a girl walks to her mother and look at her mother's hair and sadly said: "Why are some of your hair white mom?"
The mother replied, "Well, every time that you do something wrong and make me cry or unhappy, one of my hairs turns white.
The girl thought about this revelation a while, and then said, "Momma, how come *all* of grandma's hairs are white?"