whenever a person's desire remains or goes or wrong with him and dies, his soul does not
remain calm and becomes a ghost and then takes his revenge by becoming a ghost and
it is the rule of the dark world that every human should . One has to leave that world and there are some people who stay in it, that is,they become a ghost .
once such person stayed forever in tha dark world because something happened to him which was not to happen, that is why he would take revenge by becoming a ghost.