One of the "speculation movies" that got made during the 1970s (a la "Chariots of the Gods"). This one sets itself apart because it becomes apparent while watching it that director Wheeler Dixon seems to have a severe case of attention deficit disorder. The film is ostensibly about ghosts, but he starts throwing in the Loch Ness Monster, Bigfoot, aliens, and all sorts of other stuff that have nothing to do with the spirit world, although he tries to make the connections between them ("are ghosts really the living dead from outer space?"). This is one pants-crapping insane film that just begs for riffing. I believe it's also in the public domain. It can be seen here: https://www.youtube.com/watch?v=Ou9scEaCwlQ