Hello, this is my first Sherlock fanfic, so I hope I've portrayed the characters at least somewhat realistically. Please tell me what you think!

Disclaimer: I (unfortunately) do not own Sherlock.

Dr. John Watson stared at his flatmate disbelievingly, one eyebrow raised. "No you can't, Sherlock."

Sherlock Holmes was draped over his favourite armchair, feet dangling off one end, head tilted towards John with a smirk pulling up one side of his mouth.

"I'm sorry Sherlock, but you can't do everything."

"Close enough."

"Giving birth."

Sherlock mused this over for a bit before admitting, "Everything minus that."

John rolled his eyes. "Can you prove this in any way at all?"

"Why should I?"

"Because I don't believe you!" exclaimed John, slightly exasperatedly.

"You think I'm lying?"

"No, I think you're exaggerating."

"Same thing." There was a short silence while John Watson despaired over the ridiculousness of the Consulting Detective.

"Fly."

Sherlock raised an eyebrow. "Aeroplane."

"Sherlock."

"Cliff."

"Jumping off a cliff does not count as flying Sherlock."

"It does until I hit the ground."

John considered this. There was really no way of arguing that point.

"What about…shopping."

Sherlock looked confused. "Anyone can go shopping John."

"You never go shopping!"

"That doesn't mean I can't."

"Prove it."

"Ugh, dull."

"I knew it." John smirked.

"What?" Sherlock tilted his head towards John again.

"I've found something the infamous Sherlock Holmes can't do."

"What?" Sherlock quickly sat up, facing John in a glare. "I could go shopping any time I liked."

"I don't believe you." Said John, keeping his face blank.

Sherlock jumped to his feet and grabbed his coat and scarf. At first John thought he was storming off in a sulk.

"Come on John."

"Where are you going?"

"Shopping." John raised his eyebrows. "But you're coming too. So you know I don't cheat, but mostly so this isn't just a way of me getting the shopping while you sit at home laughing behind my back."

"Right." John was struggling to keep a straight face. He got up and put his coat on, following a determined Sherlock out the door.