It’s probably wrong to believe there can be any limit to the horror which the human mind can experience. On the contrary, it seems that some exponential effect begins to obtain as deeper and deeper darkness falls-as little as one may like to admit it, human experience tends, in a good many ways, to support the idea that when the nightmare grows black enough, horror spawns horror, one coincidental evil begets other, often more deliberate evils, until finally blackness seems to cover everything. And the most terrifying question of all may be just how much horror the human mind can stand and still maintain a wakeful, staring, unrelenting sanity.

Stephen King, Pet Sematary