My youtube is not working now, but I do know people that are atheist and weak agnostic/leaning atheist that do believe in ghosts. Of those few people, they are related to each other and both claim to have seen momentary "glimpses" in reflections where they said they had seen a ghost of a departed loved one and that is their basis. While there are many possible explanations for this(other than the obvious, "perhaps that was a ghost), they hold very true to this conviction because it was a personal observation that they experienced in the real world outside of the influence of psychotropic drugs or medications. While I will not rule out the possibility of ghosts(although I do think they are highly improbable, just like God), these experiences are not unlike the religious seeing their culturally identifiable figurehead(Jesus=Christians, Mohammed=Muslims etc) in apparitions. I would say the two are possibly linked, and hopefully the source of these "experiences" will be scientifically provable(eventually).

That being said, I believe there are some things that appear very supernatural when "YOU" are the one who is experiencing them. Eventhough your logical mind will say "what I believe I saw is most likely not the actual phenomenon observed."

I saw this thing on the scifi channel where they debunked different types of UFO accounts/videos, ghosts, supernatural experiences, reincarnation as either fact or fiction(or myth or something like that) and I think most of the ghost accounts and photos were debunked. Although I have seen that Ghost Hunters show only a few times, I think most of the stuff they check out is not in a "skeptical"  frame, but more looking for proof of the supernatural and wanting to take every temperature change, light flicker, and background sound as proof of the supernatural.