"This is a bad idea," Rory said. He didn't dare hope that Amy would listen to him, but he felt it was his moral duty to mention it, at least. Not that it'd do any good.

"It's a brilliant idea!" she replied. She didn't sound upset with him; she was too excited for that. "C'mon, Rory. It's a secret tunnel. You don't find those every day!"

"... true," he agreed. "But are you sure we should go inside? You have no idea of what's in there."

Amy stared at him as if he had just said the silliest thing in the world.

"That's the point, dummy. It's an adventure!"

And then she had that smile again, and those eyes, and Rory knew he wasn't getting out of this one. He even found himself starting to grin right back at her.

"Okay," he said at last. "But let's charm the entrance first, so it won't close with us still inside."

"You're brilliant!" Amy said, and tugged his arm to drag him behind her. "Don't know what I'd do without you."

"Get stuck in some unexplored tunnel, I'm sure."