Im gonna vote for this guy
Under normal circumstances the dead do not return as ghosts. If they do there must be a special reason. It follows that if a living person desires to establish communication with the dead on his own terms, in other words, to summon a spirit from his last resting place in defiance of his wishes, it is necessary to institute the most elaborate precautions that magick provides as insurance against becoming the victim of the ghosts righteous anger. Moreover there is always the possibility that the summoned ghost is nothing other than a demon in disguise.