Warn any unwanted guests away with two foreboding posters that will make it look like youve got victims trapped inside your home. Go all-out this Halloween with some terrifying decorations and pick up your very own 2 Piece Bloody Window Posters. Each of these features a white backlit background with a human figure pressing against the glass but are they the victim or the monster? On one poster the words do not enter has been written in blood while the other features a desperate call for help.