A very old man writes to his imprisioned son:

Dear son, life is going well. I was planning to plow the yard and plant some tomatoes but my back is hurting like never before. We miss you so much, if you were here my problem would be solved and we would be again happy. I hope you're well. Love, papa

Two days later, he receives a short answer:

DON'T DIG THE YARD, THAT'S WERE I HID THE BODIES!

Next day the FBI went to the yard and dug everything up and leaved a mess without founding any bodies. That same day the old man received another letter:

Dear Papa, go ahead and plant the tomatoes now. That’s the best I could do under the circumstances.