A prisoner in jail received a letter from his wife: "I have decided to plant some vegetables in the back garden. When is the best time to plant them?"

The prisoner, knowing that the prison guards read all mail, replied in a letter: "Dear wife, whatever you do, do not touch the back garden. That is where I hid all the money."

A week or so later, he received another letter from his
wife: "You won't believe what happened. Some men came with shovels to the house and dug up all the back garden."

The prisoner wrote another letter: "Dear wife, now is the best time to plant the vegetables."