Cujo may be a slightly controversial pick for the second scariest King adaptation of all time, but the realism puts it just a notch above the rest in terms of pure terror. The movie is a claustrophobic nightmare that traps a mother and son in their broken-down car as a rabid dog terrorizes them. Thanks to Dee Wallace's visceral performance as the mother, the mounting sense of fear and desperation is palpable throughout.
If you have even the slightest fear of enclosed spaces, then watching the mother and son sit helplessly in a locked car with the sun beating down on them is enough to make your skin crawl. Still, the most upsetting (and kick-butt) moment comes when Wallace leaves the car armed with nothing more than a baseball bat to face the rabid dog that's holding her and her son prisoner.