A while back, I made a post entitled, "Seeing Things: Is it all in your head?" in which I explained a theory I've heard that some of the fortean things we "see" (cryptids, UFOs, faeries, etc) may just be "pictures in our brain" that our eyes aren't seeing. The main topic of my post was ghosts as I have always seen researchers on "ghost documentaries" using equipment to measure disturbances in electromagnetic fields that are allegedly caused by spirits. It occurred to me that if a ghost can measurably control energy in the environment, perhaps they can do so with precision in a person's brain to make them think they are seeing something that isn't really there. For any skeptics who might not like the sound of this, "all in your head" can also mean psychological rather than paranormal. Of course that happens. The question is does what I mentioned above also happen? If so, I would suspect that there have been reported cases of people trying to take a picture of something bizarre that they thought they saw and then have "it" not show up in the picture after it was developed. Has this phenomenon ever been reported...let alone with sufficient frequency to support the theory I just presented? If not, then there is no reason to believe that people see vivid pictures that have been put into their mind by supernatural forces. Of course people "see things" as part of abnormal psychology, but I doubt it happens often enough for probability to mandate that one of the "seers" would have a camera on hand AND choose to use it.
I've done the best I can not to make this post sound foolish. I'm mainly interested in cryptozoology and can't discuss other fortean topics with the same eloquence.