Another is 'Footsteps on stairs.' It's a simple yet terrifying concept. You're alone in a house, and the sound of footsteps coming up the stairs when no one should be there is truly horrifying.
Then there's 'Whisper in ear.' It sends shivers down your spine. You can't see who is whispering, and it makes you feel like there's an unseen presence right next to you.
One: 'Bedroom door creaks.' Just three words but it gives a sense of unease. You're in bed, it's dark, and that small sound can make your heart race, imagining something unknown on the other side of the door.