I also dont believe in ghosts, But my dad told me he seen a ghost in the old house they used to live in and nearly shit himself, He said he came home from work one night and his nan was already in bed, When he seen this woman walk down the stairs, And she looked him straight in the face and then just walked on into the kitchen, And when he told his nanny and uncles the next day they all laughed and said he was seeing things(Which you would). After that he said no more about it, But then a few years later when he was going through some family photo albums, There she was,The woman in the photo wearing the exact same clothes, Was actually his nan's sister who had died in the house many years before
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But as I said I personally would have to see it to believe it.....