•Items disappearing and reappearing - this phenomenon, which we have dubbed "the DOPler Effect" (DOP = Disappearing Object Phenomenon), has been examined in the article "The DOPler Effect." Others have called this "the borrowers" phenomenon, and it's the familiar experience of not being able to find a regularly used item - say, your set of car keys - which you believe you placed in a spot you routinely place them. But they're gone and you look high and low for them with no success. Some time later, the keys are found - in exactly the place you normally put them. It's as if the object was borrowed by someone or something for a short time, then returned. Sometimes they are not returned for days or even weeks, but when they are, it's in an obvious place that could not have been missed by even a casual search.
•Unexplained shadows - the sighting of fleeting shapes and shadows, usually seen out of the corner of the eye. This phenomenon has also been discussed in some detail in "Shadow People." Many times, the shadows have vaguely human forms, while other times they are less distinguishable or smaller.
•Strange animal behavior - a dog, cat or other pet behaves strangely. Dogs may bark at something unseen, cower without apparent reason or refuse to enter a room they normally do. Cats may seem to be "watching" something cross a room. Animals have sharper senses than humans, and many researchers think their psychic abilities might be more finely tuned also. (See "Animals and Ghosts" )
•Feelings of being watched - this is not an uncommon feeling and can be attributed to many things, but it could have a paranormal source if the feeling consistently occurs in a particular part of the house at a particular time.