Don't turn around too quickly.

Don't turn around too quickly.
The atmosphere in the house shifted the moment the sun disappeared.
The shadow on the floor didn't shift when the clouds moved.
The back door was unlocked when I came back from the garden.
I think the basement light just flipped on by itself.
The shadow of the fence has one extra bar.
Something massive just dropped onto the ceiling directly above my head.
I saw a figure standing in the corner of my eye, but it disappears when I look.
I found a black, oily residue dripping from the doorframe.
The security camera shows me staring at the screen, but I'm looking away.
THE SHADOW UNDER THE DOOR IS EXPANDING TO FILL THE ROOM.
The lock on the window is loose from the inside.
The clock ticked twice in one second.
A faint groan from the floorboards near the window.
A handprint appeared on the outside of the living room window.
A cold hand just brushed against my ankle under the desk.
A shadow moved across the frosted glass of the front door.
I heard footsteps rushing down the corridor toward my door.