Do you believe in ghost?

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I know this is a weird question but i feel that ghosts exists i mean what happens to us after we die!!! If ghosts don't exists , then don't you think that heaven or hell don't exist either, because all of them was rised from the same myths or superstitions... I am asking this because i had a ghost experience before ... this may sound like crazy but i think i actually saw my dead grandfather ,the day he died...Ofcourse nobody would believe me since i was 10 years old except for mother who also told she kinda saw him the same day!! ...Well you may believe me or not..it doesn't matter ...so i just wanna know if anyone had any experience..! What do you think?