"Doctor!" Amy Pond yelled over the noise, "Why do we always have to crash-land? River was right; you have no idea how to fly this thing!"
The Doctor laughed wildly, holding onto the railing for dear life as the TARDIS rocked and shuddered, "Never listen to River, Amy! It's more fun this way!"
"You do this on purpose? I swear, if you hadn't thrown that manual into a supernova…I'd…I'd…" she was cut off by a particularly violent jolt; the ship sounded like it was coughing up all its machinery.
"You'd what?"
Amy finished, "I'd study it myself and teach you how to fly the TARDIS properly!" Everything stilled, and Amy looked around expectantly, waiting for the last, most devastating judder. It didn't come – perhaps they'd landed relatively smoothly today. "Where are we?"
"Ah, you're going to love this one, Pond. Ever heard of the Calistopeia Fountains?"
Amy shook her head and the Doctor continued – "Well, no, you wouldn't have. You're human, after all. You'll love them, though. Huge waterfalls, stretching for kilometres into the clouds. Showers down over the region, it's really something."
"Great, you brought me here to see rain?"
"That's not the best part, Pond. There's more! The waterfalls…they glisten like sapphires. The water is actually blue."
"The water's blue on Earth, Doctor. I don't see why it's so interesting."
"Ah, no, the water on Earth is colourless, Amy. I'm surprised you didn't remember that. It's only blue because of the reflection from the sky. The water of the Calistopeia Fountains is actually blue…the deepest blue, the most beautiful, breathtaking blue…like your scarf, Amy," he said, fiddling with the fabric around Amy's neck.
They stepped out of the time machine, the wooden doors creaking as they always did. Amy jumped back to avoid being hit by a passing car, and the Doctor sniffed, noticing the smell of petrol in the air.
"Doctor," Amy said slowly, "By any chance, do the Calistopeia Fountains look anything like London?"
"Certainly not like 21st Century London," the Doctor replied.