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An Island Adventure

You go into the cave, edging along the narrow path in single file, until the cave itself widens and you can all gather together.

The cave is tall, with a ceiling at least thirty feet above your heads.
Moss-covered walls enclose you and, looking down, you realise the cave bottom drops and that you're actually standing on a ledge above the ocean.
The crashing waves below you echo throughout the cave chamber. It's a wonder you didn't hear it until this point (almost as if someone didn't think to mention it until now).
The ocean below, powerful and deep and strong, seems to almost glow with an unnatural and effervescent light.

"I think we should jump," one of you says, looking down.

"What?" you ask incredulously.

"Look," the man continues. "I'm no Merlin but I'd bet a warthog that this water is magical."

"Magical?" a woman asks next to you.

"Well," a man behind her says. "I don't mean to grizzle but I think he could be right."

"Ah, but why would you say something so daft?" another passenger scoffs.

"I think," says the man who originally suggested jumping. "Something magical is happening here. You can all see that the water is glowing! Why the hell wouldn't it be magic water? It's only logical. And, by that reasoning, I think if we jump in it will transport us home!"

"Ok," you put your head in your hands. "You've lost the plot."

"I need a poo," someone says quietly. "Then can we jump?"

"Ok," you say, shaking your head. "You all want to jump?"

They look around at one another, and slowly start to admit that, yes, they want to jump (or at least watch someone else do it first).