Public bathroom attendant.

A boy applied for a job as a public bathroom attendant. He was told he would be given the job after he filled out the form, but the boy replied  that he could not write. The interviewer then informed him that he did not qualify.

On the way home, the boy saw some apples that were underpriced and  bought them. He sold them for double the price.

As the years passed, he ended up becoming a millionaire who owned a chain of 20 fruit stores.

One day his bank manager asked him to sign some papers.   "Sorry," he said. "I can't write. My wife looks after all that."

"You're kidding!" said the banker. "What would you have become if you could write?"

The millionaire thought for a moment and said: "A public bathroom  attendant."