Summary: What if one morning the Doctor and Sherlock Holmes wake up and realize they've switched bodies? Now they must travel across universes to find each other and set things right.
Disclaimer: I do not and never will own Doctor Who, or Sherlock. Their awesomeness belongs to BBC.
Timeline: The Doctor and Amy are traveling without Rory after he's swallowed by the crack. This is right after that episode with Van Gogh. Sherlock is between episode 2 and 3 of season three. Here you go!
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Amy Pond watched her not-so-imaginary, and rather awkward friend whiz about the consol. He babbled on about something, managing to fit what would be whole paragraph of words into one, continuous sentence. His smile was large and contagious, and his bowtie displayed the color of the TARDIS.
"You see Amelia, that's why the polarity of a blue sheep is so much stronger than a white sheep's." He said, spinning in a circle before grabbing a knob, pressing a doorbell, and pulling the 'green pulling thingy,' as he called it. "So!" he shouted, grabbing Amy's shoulders, "You've seen weeping angels, a star whale, Van Gogh; where do you want to go next?"
Amy grinned. She loved it when he said that, her beloved Doctor. "How about a beach or something, I'm itching for somewhere hot."
The Doctor raised his eyebrows, looking like a child on Christmas morning. "What about Rio?" he suggested, "Rio is brilliant, love Rio, that. The fish blow bubbles under the water, and when they reach the surface, the bubbles don't pop! They just keep going upwards like little balloons! Oh! And did I mention the ocean is rainbow colored?" He laughed, which made Amy smirk.
The Doctor was the most child-like person she'd even met, and yet at the same time, he managed to be one of the oldest alive. It baffled her if she tried to think about it to much. Amy cocked her head quizzically, only half listening to his double-time description of Rio. In a few moments, she would see it for herself. "Not Earth's Rio, then?"
The Doctor laughed, "What?! Earth's Rio? No! I'm talking the planetRio! They're got bub-"
"Yeah, yeah, you already said that, old man."
The Doctor huffed at her, clearly annoyed, "I know I already said it! But you weren't listening the first time!"
Amy rolled her eyes, her bright red hair falling gracefully down her back. "I was too!"
"No you weren't, you had your not-listening face on."
"I did not! I don't have a not-listening face!" Amy argued.
"Yes you do! See? You're wearing it again." The Doctor tapped her nose before dancing off.
"No!" She countered, "It's just my face, my normal face."
"Well if that's true, than no wonder you never pay attention when I say not to wander off." The Doctor retorted.
Amy was about to come up with a witty and wilting reply, when the TARDIS suddenly jerked to the side, sending the ginger tumbling to the glass floor. An alarm blared and the lights flickered. "Doctor?!" she shouted, not out of fear, but primarily annoyance. This sort of situation seemed to happen a lot.
"Fine!" The Doctor shouted, shoving the consol screen he clung to. It took Amy a few moments to realize the alien was taking to his ship, not to her. "Do what you want! All I want is to land on a nice, peaceful planet? Why can you never give me that?" he wasn't really angry, Amy could see, but the Doctor huffed in annoyance anyway.
The Scottish redhead tried to stand, but was thrown from her feet once more as the TARDIS shuttered. "What's wrong?" she cried above the alarms.
The Doctor didn't look at her, but she could see his shoulders stiffen.
"Doctor?!" she tried again.
"Why?" he mused, scratching his head once before clinging to the consol again, "What are you trying to do, you naughty, naughty machine?" Suddenly the bowtie clad man shouted in pain, stumbling backwards. His TARDIS shocked him!
"Tell me what's happening!" Amy practically screamed. The Doctor swung backwards on the metal bars before regaining his feet.
"I don't know!" he said. Amy's eyebrows rose. It was not everyday the Doctor said he didn't know something. "Everything's gone mad. It's like the TARDIS is drawing power from the Time Vortex, but that's only done when she needs extra power for something."
"Like?" Amy asked, finally managing to stay on her feet.
The Doctor shrugged. "Could be anything!"
"Anything?"
The Doctor was grinning manically, which Amy wasn't sure whether to find disturbing or exciting. "Hold on tight, Amelia Pond! It's gonna be a rough landing!"
Amelia screamed in fear and excitement. But suddenly she felt her heart bound into her throat. Something was wrong, as they fell, the Doctor's usually fast movements slowed to a crawl, and his eyes met hers for a brief second before they rolled backwards, "Am-" he started, and then he tumbled to floor beneath the consol.