Why do people believe ghosts exist?

I have always been scared I guess by the thought of seeing a ghost, mainly because I read up a lot about people apparently seeing ghosts and their stories seem pretty believable. However, the only people who have told me stories about ghosts are people who aren't all really 'with it' and my Granddad has... show more I have always been scared I guess by the thought of seeing a ghost, mainly because I read up a lot about people apparently seeing ghosts and their stories seem pretty believable. However, the only people who have told me stories about ghosts are people who aren't all really 'with it' and my Granddad has told me that these people who claim to have seem ghosts are all daft, he says everything has to have a substance to it and what is there to a 'ghost'? It is just common sense, if 'ghosts' did exist, wouldn't we all potentially be able to experience it? And how come so many non-religious people believe in ghosts but not afterlife? It doesn't make sense...
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