The potato farmer!
A farmer gets sent to jail, and his wife is trying to hold the farm together so she writes a letter to him in jail: "Dear, I want to plant the potatoes When is the best time to do it?" The farmer writes back: "don't go near that field. That's where all my guns are buried." But, because he is in jail all of the farmer's mail are censored. So police run out to the farm and dig up the entire potato field looking for guns. After two full days of digging,they did't find one single weapon. The farmer then writes to his wife: "Honey, now is when you should plant the potatoes."