Tonight, the two episodes of Ghost Hunters International featured zero "ghosts" or, perhaps more to the point, zero evidence of any paranormal goings-on. It was an all-debunking kind of show. Makes me wonder. . . are the spirits getting savvy to them?  Are the apparitions growing tired of performing on cue? Are they no longer getting satisfaction from making knocking sounds on command?Have they figured out that if they just ignore these uninvited hunters, there's a good chance that they won't come back with more bothersome equipment?Maybe they prefer the quiet solitude of whatever "haunt" they call home?