I had to chuckle at that scarecrow and so forwarded that to my family/friends. Would I be offended if my elementary age kids saw that? NO, they would get a kick out of it. Vulgar maybe a little, but if that is the worst things my kids ever encounter on the streets I will count it as a blessing. I would be willing to guess that is was the SIL, I would casually mention that (if the letter came unpostmarked)to her and state that the post office is looking into it being in your mailbox as a federal offense and wait for her reaction, then you will know.