The belief in ghosts appears to me as one of the most incorrigible displays of vapid ignorance around. Ghosts aren't an integral part of Christianity, yet so many pseudo-Christians seem to have a belief in them that is impervious to reason. When I was a theist, even as a child I scoffed at people who said they had seen ghosts. In fact I still scoff at them. When it comes down to it, they aren't part of very many established belief systems, but somehow, like an injector virus, ghost-belief attaches itself to another system, injects its self-replicating baloney, and the host shortly begins proselytising the gospel of ghost. The mental disease of ghost-belief is promulgated by modern pop-culture, by various ghost-hunting TV programs and morally reprehensible psychics.