I think ghost stories are all bogus, and here's my evidence: every time the ghost is subtle and clever. Know what most people aren't? Subtle and clever. If your Uncle Earl died and wanted your Aunt Martha to know he was still around, what do you think he'd do? Move a picture of them an inch to the left? Hover in the back corner of her yard, appearing as the faintest glimmer in the wind? Or would he grab her boob then fart on her when she complained?
The ghost story I'll believe is the one where the ghost farts.