Often associated with hauntings ar somewhat "mindless" ghosts that wander aimlessly or do repetitive things over and over again. Take for instance "La Llarona" or the haunting of the Borley rectory. Shades are often relegated to repeating scenes from their life or death or just wandering. often they do not see the people who see them or are not aware of anything at all. I beleive this is due to the person not developing a sense of self while alive or the destruction of the ego after death. sometimes these spirits are called zombies or lost souls, and are often a result of spiritual neglect. any other takes on this are welcome!