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 on her brunette head.
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?”
有一天，小女孩坐在厨房水槽旁看妈妈洗碗。她突然注意到妈妈的棕色头发里有几根白头发。她看着妈妈，好奇地问：“妈妈，你的头发为什么有白头发？”
妈妈回答说：“每当你做错事让我哭泣或不高兴时，我的头发就会有一根变成白色。”
小女孩想了想这个说法，然后说：“妈妈，为什么外婆的头发全白了呢？”
小女孩问妈妈为什么会有白头发，也许妈妈想借此教育小女孩不要做错事，就说是小女孩做了错事才造成妈妈的白发。但小女孩马上就把妈妈的这个逻辑应用到外婆身上。外婆全是白发，那应该是因为妈妈做了很多错事所造成的。这个易位的逻辑推导得到了荒唐的结果，让人哑然失笑。