Of course. Here are two. 'The phone rang in the dead of night. A raspy voice said my name.' and 'I opened the closet. A pair of glowing eyes peered out.' This type of two - sentence horror stories are effective because they create a sense of immediate dread. In the first one, a late - night phone call with an unknown voice saying your name is a classic horror trope. It makes you wonder who is on the other end and what they want. In the second, the idea of something lurking in a closet, which is a common, seemingly safe place in a home, is suddenly made terrifying by the presence of those glowing eyes. It plays on our sense of safety being violated in a very familiar environment.
One: I woke up to a cold hand on my shoulder. When I turned, no one was there. Two: The old doll in the attic blinked at me. I ran, but it's laughter followed.
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.
Here's another: 'The old mirror in the attic showed a face not my own. I smashed it, but the face still haunts me.' This is a classic type of two - sentence horror. It quickly sets a spooky scene with the strange face in the mirror and then adds a twist with the face still being a problem even after the mirror is broken.
One good opener could be 'In the dead of night, a strange noise echoed through the empty house.' This immediately sets a spooky mood as the 'dead of night' implies a time when things are usually quiet and the 'strange noise' makes the reader wonder what it could be. Also, the 'empty house' gives a sense of isolation which is often associated with horror.
I looked out of the window. A faceless man was looking right back at me. It sent shivers down my spine immediately. Horror often lies in the unknown, and a faceless figure is the epitome of that. It made me question my safety even in my own home.