One that stands out is 'I heard a child laughing in the empty school at night.' Empty schools at night are already spooky places, and the sound of a child's laughter when there should be no children there adds to the horror. It makes you think about the possible reasons for the laughter. Is it a ghost of a child who met an untimely end? Or is it something even more sinister?
A memorable one is 'I can't sleep at night because I keep hearing my name being whispered in my ear, but there's no one there.' It gives that feeling of being haunted and makes you shiver at the thought of an unseen presence that knows your name.
One could be 'The last person on Earth sat alone in a room. There was a knock on the door.' It's terrifying as it makes you wonder what could be knocking when there's supposed to be no one else left.
Another one might be 'The old doll in the attic blinked. I'm sure it did.' This simple line creates a sense of unease as dolls are often associated with the uncanny. The idea of an inanimate object like a doll showing signs of life is quite terrifying.
One 'red line horror story' could be about a haunted house that has a red line painted around it. People who cross the red line disappear. Another might involve a cursed object with a red line on it. Whoever touches it experiences terrifying hallucinations.
One horror story is about a cruise where the food was contaminated. Many passengers got severely ill with food poisoning. They were constantly in the bathrooms or feeling weak all over the ship. It ruined their vacations as they couldn't enjoy any of the activities on board.
Maybe there are stories about strange passengers. For example, someone who always stares at others in a really creepy way, making other passengers feel very uncomfortable.