I believe the human mind, and the power of the will, are complex and powerful. With that in mind, I have the following question: When some people claim to have seen ghosts and/or demons, or claim to have been in a well-lit room which suddenly went dark after a ritual or incantation was performed, what is really happening? (I should mention that I have spoken to people -- credible people -- who claim to have had such experiences.) Are these people simply hallucinating and/or mentally projecting into their environments? Or are these things occurring objectively in the environment itself? Or both? Thoughts anyone?