The "ghost" I saw was seen by five other people.

For me, that makes it illogical to say it is a hallucination. If it was a hallucination, I should have been the only one to experience it.
Btw, when you start saying that people who see ghosts are just idiots, other people are less likely to share their experience with you. Just in case this conversation has ever popped up in real life, its' not that enough people haven't had this sort of experience, it's just they don't want to talk to you about it.
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