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The TARDIS landed and out stepped the Doctor and his companion, Martha Jones. The Doctor, as usual, bounded out with a huge grin on his face, excited to be in a new place to show his new human friend. However, today the scanner was broken, so the Doctor had absolutely no idea what planet he was on, and was going by sight.
"Well lookie here, we've landed on... actually, I'm not sure. Where are we?"
"Doctor..." said Martha. The Doctor, as expected, wasn't paying attention.
"With all the rocks, it could anywhere! At least the sky is blue, so it's not Gallifrey or Skaro. Definitely not Thoros Beta..."
"Doctor."
"...Exxilon? Dulkis? Jaconda? Uxaerius? Telos? Oh please let it not be Telos!"
"Doctor!"
"Not now, Martha! Let's see, could we be on Dido? Lakertya? Androzani Minor? Ooh, I hope not! Er... Orestes? Sarn?"
"DOCTOR!" Shouted Martha, having grown utterly impatient.
"What is it Martha?" the Doctor replied impatiently. Martha pointed up at something the Doctor had not yet noticed: a sign that read, in English and Welsh: "KEEP OUT OF QUARRY".
"Oh." said the Doctor. "That's a new one. What are the odds that a quarry in Wales could look like an alien planet?"