From ThatSassyCaptain: Adjustable alarm clocks have been around since 1847, so why does Holmes insist on wake-up calls the morning of? Give someone a rude awakening!
"A clock?"
"An alarm clock, Holmes. You set the time you want to wake up - like so - and then it rings to wake you up - like so."
"Is this about the other morning?"
"What? Of course not! I just thought-
"You know I could have dodged."
"I know, I know. But why take the risk? Now, instead, if you need me to wake up at a particular time we can use this."
"I'm not going to use it."
"Oh for heaven's sake! Whyever not?"
"It was the element of surprise, Watson! I could take you in a fair fight!"
"Of course you could, but why not use the clock just to avoid-"
"I am not using it."
"...how is the eye?"
"Healing nicely, thank you."
"It's an impressive bruise."
"'Impressive'? Are you complimenting your own handiwork?"
"I was in the army Holmes. I thought you were the enemy! If only you had used an alarm clock, I might have punched that instead of you."
"So this Christmas gift is really for you, rather than me."
"I am not the one at risk of getting punched, Holmes. Now will you take it?"
"As it is rude to refuse a gift, I will take it. But I will not use it."
"Holmes..."
"It is a point of pride, Watson! Next time, I will dodge. Alarm clocked be damned!"
"Ugh fine. On your own head be it."