"Holmes… Do you have any knowledge of dancing?"
"Why, Watson! Isn't it a bit late to be asking for tuition in the waltz for the dance you are to take Miss Mary Morstan tomorrow?"
"Don't patronise me Holmes. Do I have to repeat the question?"
"No, of course not, Watson. I'll have you know, I am quite knowledgeable in the area of dance."
Watson snorted disbelievingly. "Really? You?"
"Yes, I find it most helpful with numerous disguises I have tried over the years."
"Then… you could teach me the waltz?"
"Certainly!"
Watson stormed into the living room, where Holmes was conducting another unspeakable experiment upon the long-suffering dog.
"What have you done to him now?" demanded Watson, pushing Holmes rather violently out of the way.
"Watson, speak your mind, as you obviously are most upset about something. Last night's dance, I suspect?"
The infuriated doctor glared at his companion.
"Yes! Do you have any idea how humiliated I am because of you!"
"Pray, tell me what faux pas I have committed this time?"
"You taught me the woman's part of the waltz, you buffoon!"