White Hair

One day, a girl walk up to her mother and look at her
mother's hair.  She studied it for a moment then sadly
said:  "Mom, why is it that some of your hair is white?"

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?"