A small plane crash-lands on an uninhabited island. There’s a pilot and three passengers, none of whom had met before the flight. At the island’s center, there’s a deep lagoon. The castaways often see strange lights flickering and shadows moving far beneath the water’s surface. Sometimes they hear distant music or the tolling of bells.
Write about a lightform being that leads those who see it to either riches or doom depending on its mood. Would it be worth the risk to follow it???
Write about a wearable object possessed by a trickster demon. A pair of shoes perhaps? A piece of jewelry? A jockstrap?