For me, it's the feeling of being trapped. Imagine being in a lair on Halloween, with all the spooky stuff going on, and not being able to escape. You hear strange noises, see creepy things, and you can't get out. That sense of helplessness makes it truly terrifying.
Once upon a Halloween night, there was an old lair deep in the forest. A group of curious teenagers decided to explore it. As they entered, a cold wind blew, and the candles on the walls flickered ominously. Strange noises echoed through the corridors. Suddenly, a shadowy figure with glowing eyes emerged from the darkness. They ran in panic, but the lair seemed to have no end. One by one, they got separated. In the end, none of them were ever seen again.
For me, it's the feeling of being watched. In a graveyard, there are so many places for unseen eyes to lurk. Every rustle of the leaves, every creak of a branch could be a sign that something is observing you, and that's truly terrifying.
The scariest element could be the loss of control. Just like in the case where a person's long nails start to act on their own, moving without the person's will. It makes one feel powerless against this strange and unnatural phenomenon.
The change in their appearance. For example, if their cute yellow bodies turn into a sickly gray, and their big eyes become sunken and bloodshot. It's a huge contrast to their normal, adorable look, which makes it really terrifying.
The constantly changing shape. In a horror story, if the parallelogram keeps changing its angles and side lengths, it can create a sense of disorientation. For example, a character might think they are running in a straight line along one side, but suddenly the side shifts and they find themselves in a completely different and terrifying part of the parallelogram - like space.
The sudden contrast between the beauty of spring and the horror. For example, the bright flowers and sunshine being disrupted by a dark, menacing presence. It's like the idyllic spring setting is being corrupted.
The unknown. In Destiny, there are so many mysteries and uncharted areas. When you don't know what's lurking in the shadows or around the next corner, it's terrifying. It could be a new and powerful enemy that we've never seen before, or some strange force that defies all the rules we know about the game's universe.
The unknown source of the shedding. If you don't know what's causing it, like in a haunted house where the walls are shedding some strange substance, it creates a lot of fear because your mind starts imagining all sorts of terrifying things.
The sudden movement of the chopsticks on their own. It goes against the normal use of chopsticks and is very unexpected, like in a story where a person is calmly eating and then the chopsticks start wriggling in their hands.
The unknown ingredient. If there's something in the pozole that no one can identify, like a strange meat or an unrecognizable spice, it can be really terrifying. It makes people wonder what they're actually consuming.