Naive reasoning 天真的推理
 
A man was telling a story to his son, a four-year-old boy. The boy noticed a lock of gray hair on his father's head and asked: "Why are some of your gray, papa?"
"Papa will get a gray hair every time his little boy is naughty," said his father, thinking to take the advantage of this opportunity to give him a moral lesson.
The boy thought for a moment, and then naively said: "Oh, I see why my grandpapa has a lot of gray hair on his head. I think he must have had very naughty boys."
有个人给他的儿子，一个4岁的男孩讲故事。小男孩注意到他父亲的头上有一缕白发，就问道：“爸爸，你的头发怎么是白的？”
他的父亲想趁机给他上一堂教育课，就回答说：“爸爸的小男孩每顽皮一次，爸爸头上就会长出一根白头发。”
小男孩沉思了一下，就天真地说：“哦，我知道爷爷为什么有那么多白头发了。我想他的儿子们一定也非常顽皮。”