Disclaimer: I do not own Sherlock. Or the Phantom of the Opera. Pity!
Because
John hesitated.
"Why is it important that the Phantom is left-handed?"
"Because!" Sherlock replied. "The man on the bridge was certainly not left-handed! Every blind man could see that!"
"Was it so obvious?" John asked. "Well, I guess I have to check the tape, once the show is over."
"Oh, please," Sherlock exclaimed. "Will you for once take my word for it? And don't mention tape!"
"Yeah, you're right," John agreed. "It isn't actually tape I am recording on, it's on memory stick."
"So, you can delete it?" Sherlock asked, hopefully.
"I can," John confirmed. "But I won't."
Sherlock inclined his head.
"Maybe *I* will."
"If you value your life, you better don't!" John suggested.
"Oh, come on!" Sherlock grunted, ruffling his hair. "This performance isn't that good! It's mediocre at best!"
"Is it?" John said, mockingly. "And you can judge about this, because …?"
He looked at Sherlock prompting.
"Because I have eyes and ears and all four of them are not pleased!" Sherlock answered.
"Then go into your room!" John demanded. "Because the commercial break is over and I would like to enjoy the rest of the show now without you interrupting! So please! Go!"
Sherlock threw a laugh.
"I wouldn't dream of it."
"Then shut up at least!"
"Why?"
John clenched his hands into fists and growled.
"Because!"