YouTube is a veritable cesspool of uploaded videos of supposed ghosts. Anyone even remotely interested in the subject has probably run across hundreds of these alleged apparitions posted by every Tom, Dick and Harry from here to Timbuktu. Whether or not you believe in ghosts is your opinion. But regardless, there are a lot of unnerving uploads out there and we've picked out five of our favorite "ghost video countdowns". Is it proof? Probably not. But it's a good time nonetheless.