Nightmare Fuel / Cujo

  • Trapped in a car, with a rabid St. Bernard lurking around, and meanwhile, your four-year old son is going into seizures.
  • The three most particularly terrifying scenes post-rabies infection, are when the titular dog mauls his owner and the neighbor, when he takes a bite out of the mom while she and her son are trapped in the car, and the penultimate scene when, having gotten back up from a No-Holds-Barred Beatdown inflicted by the mom with a baseball bat moments earlier, he shows up unexpectedly just before he dies via gunshot inflicted to the head. Yep, Paranoia Fuel aplenty.
  • It's a small moment, but there is one scene in the book where Donna chances a look out the driver's side window, only to be face to face with a deranged Cujo. It plays way too well to the fear of looking out a window only to see someone looking in at you.
  • The scene where Cujo becomes infected with rabies. He's chasing a rabbit in a bright field and tries to scare the rabbit out of a bat's nest, causing a bat to bite Cujo in self defense. It's like a peaceful dream that slowly turns into a nightmare and you can really see how dark Stephen King's mind was when he was writing the story. In the novel itself, it's even depicted as a bit of a Tear Jerker — King wrote from Cujo's perspective, showing Cujo's self-loathing for getting bitten, and the dog's deep fear that his owners would be angry with him and call him a bad dog.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/Cujo