Another really scary one could be 'My phone rang at 3 am. The caller ID said it was me.' It plays on the idea of the self being something other or unknown, and calls at that time are always spooky.
The old cemetery was silent. A man went there at midnight. He felt a chill in the air. Then he saw a ghostly figure floating above a grave. He ran away as fast as he could.
One way to sentence horror stories is to build suspense gradually. Start with an ordinary setting or character and then introduce strange elements little by little. For example, you could begin by describing a normal day in a small town. Then mention a strange noise that no one can identify or a person who behaves oddly. Use vivid language to describe the uneasiness that starts to spread among the characters. This makes the readers feel on edge as they wonder what will happen next.
The night was a very scary time because the silence around them made it seem as if one could hear their own heartbeat. The moon hung high in the sky, illuminating the dark night, giving people a gloomy feeling. The air was filled with a faint fragrance that reminded people of those unlucky things.
I think 'The clock stopped at midnight. Then I heard footsteps.' is quite scary. It gives this feeling of something ominous starting right at a spooky time.
Story 1: The old house stood alone in the dark woods. Every night, a cold hand would reach out from under the floorboards. Story 2: She walked into the empty classroom. A shadow on the wall began to take the shape of a menacing figure.