The Colour Out of Space/YMMV

""And yet amid that tense, godless calm They were twitching morbidly and spasmodically, clawing in convulsive and epileptic madness.""
 * High Octane Nightmare Fuel: The fate of the Gardner family is possibly one of the scariest things Lovecraft ever wrote.
 * The  at the climax were seriously disturbing. They're a prime example of Lovecraft's "just fundamentally wrong" sense of horror.