in my old house in Camberwell, about 12 years ago, i walked out into the hallway and found a broom standing at a 45 degree angle on the edge of a step halfway down the stairs. just standing there on its own. it stayed there for about 15 seconds then fell down to the bottom. was as if something was holding it there, then just let go. regardless of cause, its one of the freakiest, dog titling its head, mind &*?$ things i've ever witnessed. will never forget it.