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, 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 That such events have their own Rube Goldberg absurdity goes almost without saying. That may be the point at which sanity begins either to save itself or to buckle and break down; that point at which one's sense of humor begins to reassert itself.When King is at his best--as he is for large parts of the frequently terrifying Pet Sematary--he is remarkably convincing on that point, putting his characters under more and more pressure, stripping away one by one the defenses of disbelief and rationality, leaving them to confront the horror plain. Like no other writer I can think of except Dorothy Dunnett, he makes us believe in--and understand--just how far a person can keep going, keep pushing, keep fighting despite exhaustion, pain, injury, and loss. As Ambrose Bierce put it in "The Boarded Window,"
There is a point at which terror may turn to madness; and madness incites to action.