One day a little girl was sitting and watching her mother do the dishes
at the kitchen sink. She suddenly noticed that her mother had several
strands of white hair sticking out in contrast to her brunette hair.
She  looked at her mother and inquisitively asked, "Why are some of 
your hairs white, Mom?

Her mother replied, "Well, every time that you do something wrong and
make me cry or unhappy, one of my hairs turns white.

The little girl thought about this revelation for a while and then
said, "Momma, how come ALL of grandma's hairs are white?"