An old photograph that seems to change on its own can be a very spooky hook. 'He found an old photo in the attic. It was a picture of his family from decades ago. But every time he looked at it, a new figure seemed to appear in the background, a figure with a menacing look in its eyes.'
A mysterious figure that appears briefly and then vanishes can be a great hook. Such as, 'Out of the corner of her eye, she saw a shadowy figure, tall and gaunt. But when she turned to look fully, it was gone, leaving only a chill in the air.'
One great hook could be starting with a strange sound in the dead of night, like 'In the pitch - black night, a shrill scream pierced through the silence, making every hair on my body stand on end.' It immediately grabs the reader's attention.
A good hook for a scary story might be 'She opened the attic door, not knowing that the moment she stepped inside, she would be plunged into a nightmare world. The air was thick with a musty smell and an unidentifiable sense of foreboding. As her foot touched the dusty floorboards, she heard a soft whisper that seemed to come from everywhere and nowhere at once.'
You can use a sense of the unknown. For instance, 'There was a place in the forest where no one dared to go. The trees grew so thick that light couldn't penetrate, and strange whispers seemed to come from within.' This makes the reader wonder what's in that place.
A chance encounter in an unexpected place can be a great hook. For example, two people meet during a sudden rainstorm while seeking shelter under the same small awning. It immediately creates a sense of shared experience and a bit of mystery as they look at each other for the first time.
A sudden loss, like the death of a beloved pet. It immediately grabs the reader's heart and makes them empathetic.
A mysterious statement or question can serve as a good hook. Such as 'The door was ajar, and what lay beyond it was something no one could have ever imagined.' This makes the reader curious and eager to find out what's behind the door.
A mysterious event or a strange noise can be a good hook. For example, starting a story with 'In the dead of night, a shrill scream pierced through the silence.' It immediately grabs the reader's attention and makes them wonder what's going on.
An unusual object or symbol that keeps popping up can be a good hook too. Say, a strange amulet is found at every crime scene. This mystery surrounding the amulet will intrigue readers and make them eager to find out its significance in the story.
How about starting with 'The moon was blood - red, casting an eerie glow over the desolate forest. A sudden silence fell, broken only by the faint sound of something large and unseen moving through the underbrush.' This immediately sets a spooky mood.