For his scariest novels like 'It', the fear of the unknown is a big factor. We don't fully understand the true nature of It. Also, the vulnerability of the children characters makes it scarier as we naturally want to protect the young. And the fact that It can be anywhere, hidden in the sewers or disguised as something friendly, is truly terrifying.
In 'The Shining', it's the psychological aspect. The slow descent of Jack Torrance into madness. We see his inner turmoil and the way the hotel seems to be manipulating his mind. The isolation of the family in that huge, empty hotel with all its secrets adds to the sense of unease. It makes you wonder what could happen if you were in such a situation, trapped with someone losing their grip on reality.
Regarding 'Pet Sematary', it's the violation of the natural order. Bringing the dead back to life goes against everything we know and accept. The changed and often malevolent nature of the resurrected beings is what makes it so scary. It makes us question the boundaries of life and death, and the consequences of meddling with things that should be left alone.
In 'The Shining', the setting plays a huge role. The large, empty, and haunted hotel. The long corridors and the feeling that something is always watching. Also, Jack's transformation from a normal father and husband to a crazed killer adds to the horror. It shows how isolation and the power of the hotel's evil can break a person.
For his scariest novels like 'It', the ability to tap into universal fears is key. Fear of the unknown, fear of something lurking in the shadows. Pennywise represents that unknowable evil that can be anywhere. Also, the detailed descriptions of the town and the sewers where It hides make it seem more real and thus scarier.
For novels like 'Salem's Lot', it's the transformation of a normal town into a place full of vampires. The slow takeover, the people you know turning into blood - sucking creatures, and the feeling of being trapped in a place where evil is spreading. Also, King's vivid descriptions make it seem so real, as if it could be your own town that gets infected.
For many of his scariest stories, it's the way he taps into our deepest fears. Like in 'It', the fear of the unknown and of things that go bump in the night. He also creates really vivid and disturbing characters. In 'The Shining', Jack Torrance's transformation is both believable and horrifying.
The way he creates a sense of unease. His vivid descriptions of ordinary places turning into something menacing. For example, in some stories, a simple small town becomes a place full of hidden horrors.
The psychological depth. Stephen King has a knack for getting into the minds of his characters. In his scariest short stories, he often explores the darkest corners of the human psyche. For example, in 'The Mist', the fear of the unknown and the breakdown of society under extreme circumstances play on our deepest insecurities.
Take 'It' for example. It's scary because it targets children. Children are often seen as innocent and vulnerable. And Pennywise can take different forms, exploiting the fears of each individual. It's also set in a small town, which gives a sense of familiarity, making the horror more real.
The settings are important too. For example, in 'The Shining', the haunted Overlook Hotel is a place full of mystery and danger. Isolated and with a dark history, it sets the perfect backdrop for a scary story. The sense of being trapped in such a place adds to the horror.
His settings are often really spooky. Take 'Salem's Lot' for instance. A small town that gets infested with vampires. The idea of the familiar, a small town, turning into a place of horror is very disturbing. The old houses, the quiet streets that now hold a deadly secret, all contribute to the overall scariness.
The unpredictable nature of the horror in Stephen King's scariest stories is quite terrifying. In stories like 'The Shining', you never know when the next spooky event will occur. The haunted hotel has a life of its own and the ghosts seem to be everywhere. Also, his use of ordinary settings turned into something menacing is scary. A simple small town can become a place full of lurking evil, as seen in many of his works.