Well that would be because, since they believe in ghosts, they put down what they see to ghostly activity. I've seen a helluva lot of weird and freaky stuff that I'm sure could easily be assumed to be ghosts. It wasn't, of course, and a few shut windows, fixed boilers and re-insulated pipes and walls eliminated the problem.
There is but one Grim Reaper in the 'verse, and he rides a white horse called Binky.
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