"Sherlock!"
Sherlock turned his head to see a young girl with teased hair and quite a colorful choice of clothing. He made a face as the girl stopped in front of him.
"And you are?"
"Emerald Star Holmes! I'm your long lost sister," she exclaimed happily, a wide grin then appearing on her face. Sherlock scoffed and shook his head.
"Ridiculous. You can absolutely not be related to me."
"Oh really? Give me reasons why!"
"That is easy. First of all, I'd like to start with the very obvious; the name, the hair, and the clothes. You're what people consider as a 'scene kid', yes? Mycroft would scold you to no end," Sherlock said. "And now we shall move on to the other obvious things that are obvious to me at least. First of all, you clearly seem to have a few problems in your social life..."
Let's just say the scene girl never came back after 2 hours of reasoning.