An old farmer wrote a letter to his innocent son in prison:

"This year I'm unable to plant potatoes because I can't dig the ground. I know if you were here you would've helped me."

His son replied: "You idiot, don't dig the ground, I have hidden guns there." Pretty soon, the Police read the letter, and the very next day the ground was dug by the police, and searched for guns but nothing was found. The son wrote again: "Now plant your potatoes dad, its the best I could do from here."