Those are exactly the people I don't believe. If it's merely a feeling that a ghost might be there that's driving them to that conclusion, then it could certainly be misinterpreted. However, if they actually saw something; something that they cannot explain (i.e. someone in their house when all the doors are locked, someone who's been dead for years), then I will believe them.
And also, I usually only believe people I know wouldn't lie to me about such things.
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