Zod Wallop by William Browning Spencer is one very strange book. I can't remember where I heard about it, possibly in a discussion about books within books (one of my favorite reading categories). This one is downright trippy though, when the horror story becomes reality, or perhaps drug-induced shared telepathic hallucinations... anyway, it leaves you upside down and sideways but is well worth the wild ride.
Apparently it is often compared to The Land of Laughs by Jonathan Carroll, which happened to be in at the library last night so its now waiting on my towering to-be-read pile.