Another could be 'I walked into the abandoned asylum. A cold breath on my neck told me I was not alone.' The idea of being in an already eerie place like an abandoned asylum and then feeling a cold breath, which indicates the presence of something unseen, is quite terrifying.
Maybe 'The old house was silent. Then a figure emerged from the shadows, its eyes glowing red.' Here, the sudden appearance of the menacing figure with red - glowing eyes in the silent old house creates a spooky atmosphere. The contrast between the initial silence and the appearance of this unknown and potentially dangerous entity is what makes it a horror story in just two sentences.
Sure. 'I found a doll in the attic. At night, it moved on its own.' Dolls are often creepy, and the thought of one moving by itself at night is really scary.
Story 1: I woke up to a cold hand on my face. When I turned on the light, no one was there.
Here's another: 'The old doll in the attic blinked. I ran out and never went back.' This creates a sense of unease with the simple and unexpected actions. The blinking of the doll, which is an inanimate object, is very creepy.
One story could be: 'I woke up to a strange noise in the attic. When I went to check, a pair of glowing eyes stared back at me.'
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.
One from the list could be 'I woke up to find a handprint on my window. I live on the 13th floor.' Another might be 'The old doll in the attic blinked. It was facing the wall before.'
A third story could be: 'I took a photo of the cemetery. When I looked at it later, there was a figure standing behind me that I didn't see when I took the picture.' It gives a feeling of unease as it implies that there was some sort of ghostly or otherworldly figure present at the cemetery that the person was unaware of until they saw the photo.
One story could be 'I heard a scratching at my window. When I opened my eyes, a pale face stared back at me.'
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.
One story could be: 'I woke up to find a handprint on my window. It was on the inside.'