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I really liked the idea of the storytelling component of our brain that is capable of confabulating a consistent, elaborated story to make sense of the things that we may perceive with our senses.  I think back to experiences that I've had in my own lifetime and this seems to explain a lot of tendencies which I previously lacked an explanation for.  For instance, when I was a kid, I typically was afraid to go into a particular room in my house because I swore it was haunted.  This assumption was directly linked to the idea that I thought I saw a ghost-like figure move across the room out of the corner of my eye one day when I was there by myself.  It now makes sense that I could have been perceiving something like a change in light from the window and, consequently, in an effort to make sense of this perceived alteration in my sensory input data, my storytelling component made me convinced of the fact that I was seeing the undead.