Life After Death....

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Do you believe in Life after death? There are people who say that people who have been betrayed or have been cheated by someone come back to take revenge? I know it sounds funny but i have come across many people wo feel this is true. Or people who have unfulfilled strong desires and die without acheiving them do not attain nirvana and still are on this earth until they dont get what they need... We also call them ghosts... so do you believ in this and if yes why?have you come across any such incidences?