my mail is possessed!

lets have a little fun and send some freaky mail! Decorate one envelope with some sort of demonic force and then send it to your partner to creep out the mail people! Nothing to graphic, i'm not entirely sure the postal services guidelines on such. then put something fun for your partner inside, an atc, fun stationary, stickers, what have you. items don't have to be demonic too, just something they would like. Can be a regular or bigger envelope that's all up to you!