 If I were sentenced to spend a night alone in a graveyard,  I should already know that twigs would snap and the wind moan and that there would be half-seen movements in the darkness.And yet, after I had been frog-marched into the graveyard, I should feel a thrill of fear every time one of these things happened..."
In many traditional accounts, ghosts are often thought to be deceased people looking for vengeance, or imprisoned on earth for bad things they did during life.The appearance of a ghost has often been regarded as an omen or portent of death.