Silence. Silence can be scarier than any noise. In a situation where there should be some sound, like in a forest at night where there are usually animals making noises, but instead there is complete silence. It could mean that something is lurking, waiting to pounce. It makes you wonder what's out there that has silenced everything else.
One 'two sentance horror story' could be 'I always sleep with a nightlight. Last night, I woke up to find it was still on, but I was in complete darkness.' It's terrifying because the contradiction between the nightlight being on yet in complete darkness creates a sense of the unknown and a break in the expected reality.
One '2 sentance horror story' could be 'I woke up in the middle of the night. There was someone standing at the foot of my bed.' It's terrifying because the sudden realization of an unknown presence in your most private and vulnerable space, your bedroom at night, sends shivers down your spine. You don't know who it is or what they might do.
The mirror showed no reflection.
There was this manhunt horror story in a forest. A group of campers were being hunted by a mysterious figure. They ran through the dark woods, branches scratching at them. One by one, they started to disappear. The remaining camper could hear their screams in the distance as he desperately tried to find a way out. The sense of being prey was overwhelming.
She looked into the mirror. A figure behind her grinned, but there was no one there when she turned around.
In '100 word horror stories', there might be a story of a cursed mirror. A girl looks into it. Her reflection starts to change. It becomes distorted and menacing. Dark shadows start to seep out of the mirror, surrounding her. She tries to run but the shadows keep following her everywhere she goes.
One story could be 'I always sleep with a nightlight. Last night, I woke up to find it off and a cold hand on my wrist.' Another might be 'The old doll in the attic blinked. Now it sits at the foot of my bed.'
A really scary one is 'My sister said she couldn't see the man standing behind me. I don't have a sister.' Here, the sudden realization that something is very wrong and the idea of an unseen presence are really creepy. It combines the elements of a false sense of security and a disturbing revelation.
I found a doll in the attic. Its eyes followed me everywhere. It was really creepy.
One terrifying real - life horror story is about a family who moved into an old house. Strange noises started at night, like footsteps and whispers. They found out later that the previous owner had died mysteriously in the house. It was really spooky as they often felt a cold presence. Every time they tried to sleep, they could hear the noises getting closer, and it was a nightmare for them until they finally moved out.