Ever felt the hair on the back of your neck stand up, or even on your arms? Ever feel a chill in the room, for no reason? Feel that someone is in the room with you, catch them moving out of the corner of your eye, but, cannot really see them?
Ever noticed anything odd in a photograph, that wasn't there when you took the picture?
Ever noticed a baby, pre-occuppied or entertained by something that noone else sees? Laughing and cooing at it? Their eyes will even follow it as it goes across the room?
Ever had a child tell a story about an ancestor? Or about a time when the child was too young to remember, or wasn't born yet? But tells it with amazing accuracy, details the child could not have known?