One reason could be the unknown. If the hand in the story has some sort of strange power or origin that's not clear, it creates fear. For example, if it moves on its own and there's no explanation for it, it's really spooky.
The fact that it moves on its own is really terrifying. It defies the normal state of things, and that unknown power behind its movement makes people scared.
The unknown factor makes it terrifying. You don't know what's licking your hand.
The idea of a hand licking can be terrifying because it often implies something is wrong with the hand, perhaps it has a mind of its own. It might be possessed or cursed. Also, the act of licking can be associated with predatory behavior, like an animal getting ready to attack. And when it's a human - like hand doing it, it blurs the line between human and something more sinister.
The unknown elements make a scary story terrifying. When there are things that the characters and the readers don't understand, like a strange noise in the dark or a figure that appears and disappears without explanation, it creates fear. For example, in a haunted house story, if there are unexplained cold spots or voices, it gives a sense of unease.
The hairy hand itself is probably quite scary because it's not normal. Hairy hands usually bring to mind something wild or inhuman.
Maybe it's the use of vivid and gory details. For example, if it describes some grotesque monsters with sharp teeth and blood - red eyes. That kind of visual image can easily send shivers down one's spine.
The idea of four corners in a scary story can be terrifying because it gives a sense of enclosure. It's like you're trapped within this space defined by the four corners. Each corner can hold a different element of horror, whether it's a strange sight, a spooky sound, or an unknown presence. It also creates a kind of symmetry in horror, where you expect something bad to be in every corner, and as you explore each one, the tension builds up more and more.
The unknown. In a Beatrice scary story, often things are left unexplained. Like if Beatrice sees a strange shadow that just disappears. We don't know what it was, and that mystery creates fear.
The suspense in 'the watcher scary story' is what makes it so scary. It might build up slowly, like the watcher's presence being hinted at through small signs at first. Then, as the story progresses, the feeling of being watched intensifies without a clear understanding of when or how the watcher will make a move.
The idea of people being dragged into a TV world is quite terrifying. It's something that's so unexpected and out of the ordinary.