When it comes to demons, you have a number of options: you could line your doors with salt (but that's easy to disturb), you can ring the house with iron railroad ties (which your home owner's association would love), or you can tattoo every member of your family with anti-possession charms (which still leaves them vulnerable to getting all their parts broken). No, what you need is a good, old-fashioned devil's trap. Get one of those black-eyed buggers stuck in one of those and you have all…