The psychological aspect is the scariest. You start to feel isolated because you don't know what's going on with your body. People around you might look at you strangely. And the fear of the unknown builds up in your mind. You might start to imagine all sorts of horrible things, like it being a mark of a demon or a curse, and that can drive you crazy with fear.
The unknown origin. If you can't remember how you got a hickey and it starts to have strange symptoms, like changing color or shape, it's really scary. It makes you wonder what kind of force or entity caused it.
Perhaps the scariest part is when the saffron, which is usually associated with beauty and luxury, turns into a source of danger. Like in a story where saffron powder is used in a voodoo - like ritual against someone. The person starts to have hallucinations and feel a strange presence every time they are near saffron, which was once a normal and pleasant thing in their life.
The scariest part could be when the donuts start to come alive. Just imagine you're sitting there with a plate of donuts, and suddenly they start to move and show signs of life. It's a total violation of what you expect from a donut, and it would be really terrifying.
The scariest part could be when the piano starts to play on its own. Imagine you are alone in a dark room and suddenly the piano keys start moving and a strange melody fills the air. It gives a feeling that there is an unseen entity present and it's using the piano to make its presence known.
In a friends horror story, the sudden disappearance of one of the friends can be the scariest. It leaves the others in a state of confusion and fear, not knowing what has happened. And as they search for their missing friend, they encounter more and more terrifying things, like strange noises or signs that something really bad has happened to their friend.
The scariest part could be when the dinosaur suddenly appears out of nowhere. For example, in a story where a group of hikers are walking through a forest that used to be a pre - historic site. They think they are safe, but then a velociraptor jumps out from the bushes right in front of them. There is no warning, just sudden danger.
In a Coneheads horror story, the scariest part could be their intentions. Since they are so different from us, we don't know if they are friendly or hostile. They might be there to do something truly evil, like steal people's souls or bring a great curse upon the land. The mystery of their motives is what makes it so terrifying.
The scariest part could be when Santa's appearance is distorted. For example, his rosy cheeks are replaced with sunken hollows, and his bright eyes turn into dark, soulless pits. It completely shatters the traditional image of Santa that we all grew up with.
The sense of being watched. When Edd feels that there are eyes on him, but he can't see who or what it is. He might start to doubt his own sanity as he constantly looks around, trying to catch a glimpse of whatever is observing him in this horror - filled situation.
The scariest part could be when the unknown is revealed. For example, if Moira has been hearing strange noises for days and finally discovers it's a malevolent spirit. It's that moment of realization that there's something truly terrifying there that sends shivers down the spine.
The scariest part could be the sense of isolation. For example, if Adele is in an old house all alone and there's no one to turn to when the strange things start happening. She has no way to call for help and is completely at the mercy of whatever is causing the horror.