As nights are drawing in and Halloween is nearly here, I love these mumsnet threads.
I'll start, many years ago I lived in a flat where sadly two builders had died when their scaffold had collapsed outside. My bedroom was on the top floor and quite often I would hear voices on the landing outside (always at night of course ;) I would never leave the bedroom, even to go to the loo and it was really disconcerting!
Also another flat I lived in and there was something so off about it, the energy was so dark and there was a room off the kitchen that just felt cold and horrible, and it wasn't just me who thought it, friends who came over commented on it too.
Couldn't wait to move from either flat!