I live in one, although I figured out how to appease the ghost, spirit or whatever.  When I bought the house there was a small bedroom upstairs that was locked.  I bought the house the same day because it was such an awesome deal and I got cash  discount 
  
Well after a couple of months living there (not even having used any of the upstairs at all) I finally decided to pick the lock and see what was up there.
Blood and gore splatters all over the place, the hardwood was stained with what looked fresh(er) and older bloodstains.  In the middle of a pile of bloody clothes was an old wood axe that was literally gore covered.
Cops called, nobody knew anything, the owners of the house knew nothing cause the house had been vacant for years before they listed it (summer house).  Investigation turned up nothing.
Anyways, if you take the axe out of the room stuff happens.  If you leave the axe in the room, nothing goes on.  But when things go bump in the night when the axe is out of there, it really bumps hard and scary.
Finally buried the axe in the wall behind new drywall after I remodeled, and it was enough to appease the spirits.  Taped to the axe is a note in a ziploc baggie telling the story of the room and where I was to that point.
I could write for pages and pages, but I don't want to hi-jack this thread.
ETA - Since the remodel the room is still referred to as the blood room