Actually, HoS, I don't believe in ghosts. I'm really only posting here in good humor (obv. since here I am talking about perverted ninjas). But what I was saying was that even if we do find conclusive evidence of ghosts, it's going to end up like the case of the giant squid where they will refuse to call them ghosts. No scientist is ever going to stand in front of a podium and go "those superstitious motherfuckers were right!"
But because I don't believe in ghost, I do not rule out the potential of ghostly sightings/experiences eventually being explained under one unified rationale. I'm sure we'll find one concrete reason for most "ghosts" one day, it's just gonna be called something else. It's probably a lot more literal than that.