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 kinds of time to figure out what to do next.
I should specify that I mean in Supernatural, right? Maybe I should have started with that. In any case, a devil's trap at your front door tells the world that you are a fan and tells demons that they aren't welcome. (Disclaimer: May not do anything about hellhounds. Shoulda thought about that before you sold your soul.)
- A door mat (Ours is double-sided for extra trickiness)
- Spray paint
- Acrylic paint
- Fabric medium for paint
- Brushes, cutters, drawing stuff, etc.