I walked into the forest. The trees whispered my darkest secrets.
The forest was silent. Then a voice said my name and I was alone.
The forest was thick and dark. I felt like I was being followed. A howl echoed and something grabbed my ankle.
I was alone in the attic. Then I felt someone whisper my name in a voice I didn't recognize.
The little girl found a doll in the forest. As she picked it up, the doll's eyes started to bleed.
One way is to set a spooky scene in the first sentence, like 'The graveyard was covered in fog at midnight.' Then, introduce a terrifying element in the second, such as 'Out of the fog, a pale hand reached for me.'
In the dark forest, I lost my way. Suddenly, branches reached out like arms and a voice growled 'You're trapped now'.
The phone rang at midnight. When I answered, all I heard was heavy breathing and then a whisper of my name from an unknown voice.
The moon was full. But the werewolf outside my window wasn't howling at it, but rather staring right at me.
Of course. 'The door opened on its own. A shadow slid inside.'
Once, I went into the forest. I saw a deer with shiny eyes among the trees. Then I followed a stream and found a hidden waterfall.
Well, it's about the unexpected. In a 'two sentence horror story' like 'I heard a knock at the door. When I opened it, there was nothing but darkness.' The suddenness and the unknown in just two sentences can send shivers down your spine.