High school classmate Lao Zhang, with the worst grades, sleeps every day. After graduation, he opened a junk recycling station, and we all laughed at him.

Ten years later, at the class reunion, he arrived in a Bentley, wearing a watch worth a house. Everyone gathered around him to toast and asked how he made his fortune.
He said: "It's nothing much, just when I was collecting scrap, I met an old man who told me there was copper in an abandoned factory, so I went to get it."