Sure. Here is one: I woke up to a hand on my face. When I turned on the light, there was no one there.
A man always heard a baby crying at night. One day he found out the sound came from his attic where a doll sat alone. It was the doll that made the crying sound all along. It had belonged to a child who died in the house decades ago.
The last person on earth sat alone in a room. Then there was a knock at the door.
In the old cemetery, a voice said, 'Leave now.' But there was no one there. Just the ghosts.
There was a knock on the door. I opened it, but no one was there. Then I felt a cold hand on my shoulder.
Walking in the forest, I heard a whisper calling my name. No one was there.
Sure. Here's one: I used to be a baker, but I couldn't make enough dough.
Sure. 'I started with a simple idea, worked hard every day, and now I own a successful business.'
The last man on Earth sat alone in a room. There was a knock at the door.
One liner scary stories are effective because they create a sense of mystery and unease quickly. They leave a lot to the imagination, which can be scarier than a detailed horror story. For example, 'I saw a face in the window, but I live on the top floor.' makes you wonder how that face got there and what it wants.
The brevity. It hits you fast and leaves your mind to fill in the blanks which often makes it scarier. For example, 'The last person on earth sat alone in a room. Then there was a knock on the door.' It makes you wonder who or what could be knocking when there's no one else supposed to be there.
The mirror showed my reflection smiling, while I was crying.