An old farmer writes to his son in prison: "Dear son, this year I won't be able to plant potatoes because I can't dig the field by myself. I know if you were here you would help me!"

The son writes back: "Dad, don't even think of digging the field because that's where I buried the money I stole!"

The police read the letter and the next day the whole field is dug up by police looking for the money, but nothing is found.

The following day the son writes again: "Now plant your potatoes, Dad. It's the best I can do from here!"