Ok, I sort of stole the idea (along with some of the text) from Saterday night live...

Bleeding walls:  well, you can't cover this up with wallpaper.  It will just bleed right through.  Nah, you got to cover it with some double-polymere water proof paint.  That should do it.  But if you ever scrape the paint, blood will ooze out.  I don't suggest fixing that with a band-aid.

Flying objects:  Well, you can bolt down your furnature, but you can't do much about other objects.  I would suggest leaving the room when objects start to move, once you leave they should settle down.  Remember to keep kitchen drawers closed, you may want to install small locks on them.

Demon voice:  Well, you cannot really stop a demon voice, as it always comes from another floor.  What you can do is use thicker insulation, they have some nice brands out now, and some sheets of hard wood.  You can't really sound-proof your floors to get rid of it, but it can change the voice from a loud "BOW DOWN TO EVIL PITIFUL HUMANS" to a more coversational tone like "bow down to evil, pitiful humans".  Much more pleseant.

Possesed animals and children: I would suggest not keeping any pets in a house like this, possession can be a real problem.  If you want to, you can keep goldfish.  They are harmless even when possesed.  The glowing red eyes will actually add to the beauty of the fish.  Or you could just get a lava lamp.   Now, young children can also be possesed, but they won't act much different from how they will act when they are teenagers anyway.

Hell mouth: ooh, a hell mouth.  You really can't cover these up, as they lead down to hell.  Best thing you can do is make it part of the room.  Put pedistals on each side and put down stone tile around it.  Almost like a fire place.

well thats all for today, make sure to stop by next time where we will show you how to keep out foot prints from nowhere and keep moving statues in their place.