My idea for a prompt would be; Campfire Stories Made Real "They say he still roams the forest, stalking unwary travellers in search of vengeance..." "Behind you, look!" "You've got to be kidding if you think I'm falling for tha-" ... Doesn't strictly speaking have to be a horror themed story, but I love the idea of playing with the line between a story and the effect it has on the real world.