From cjnwriter - A prank goes wrong.
"It was only meant in good fun," Lestrade chided, but there was no real heat to his words. "Constable Rogers-"
"Will never make Inspector." Holmes peered through a small lense at some soil on the victim's trouser leg. "It isn't as though Watson's army background is a secret."
"Well, no, but with his shoulder and leg so- ah, Doctor!" Lestrade coughed, throwing Holmes a warning look that went literally over the detective's head as he moved onto an examination of the fingernails. "How er... How is Rogers?"
Watson looked suitably embarrassed. "The shoulder was dislocated, but I've popped it back in and given him something for the pain. I really am so sorry Lestrade, I simply hadn't expected the Constable to sneak up on me like that!"
"He's a silly lad, no need to worry Doctor."
"Might we please get back to the matter at hand?" Holmes demanded, gesturing to the body on the floor. "Watson I need your opinion on the time of death."
With another, hastier apology, Watson excused himself to do as Holmes asked.
The misjudged prank was forgotten, but word soon spread swiftly until everyone at the Yard came to understand that Doctor John Watson was every bit as formidable as Mr Sherlock Holmes.