Sure. There's the story of the Bloody Mary. Legend has it that if you go into a bathroom with the lights off, light a candle, and say 'Bloody Mary' three times while looking into the mirror, a ghostly figure will appear. It's said she was a witch who was killed in a very brutal way and now haunts those who summon her.
Well, '21 scary stories' might be a collection of tales that are designed to send shivers down your spine. Each story could potentially feature elements like ghosts, monsters or psychological terrors.
The scariest element could be the sense of the unknown. In many stories, there are things that can't be explained easily. Like a strange light in the attic that no one can figure out what it is.
Well, '66 Scary Stories' must be full of spooky tales. It could include stories about haunted houses, where the creaking floors and cold drafts are signs of something sinister lurking. Maybe there are tales of ghosts that roam the night, making strange noises and sending chills down people's spines.
One story could be about a haunted house. People heard strange noises at night, like whispers and creaking floors. They felt a cold presence even in the middle of summer. It was so terrifying that they couldn't stay there any longer.