Some examples could be 'Shadow on wall.', 'Silent phone rings.', 'Voices from void.' These short phrases can quickly create a sense of unease and horror as they imply something strange or menacing. For instance, a shadow on the wall can make one wonder what is casting it, especially if there's no obvious source. A silent phone ringing can be quite eerie as it goes against the normal expectation of a ringing phone having a sound.
Here are some: 'Bedroom door creaks.', 'Footsteps in attic.', 'Eyes in the dark.'