Not to mention when Lestrade doesn't recognize Watson in disguise... When Dr. Watson showed up at New Scotland Yard in his disguise, Lestrade was prepared to commit the man to St. Bartholomew's Hospital.
Mary gets a funny Pintsized Powerhouse moment when her husband tells her Holmes has been rescued - even Watson ends up chuckling.
Mary: "John Hamish Watson! You did not think to send me word?"
Watson: (winces) "I did not want you to come to Baker Street just yet — it's been too dangerous."
Mary: (raised eyebrow) "John, in the event that you have somehow forgotten, I am now quite capable of defending myself. You made certain of that, and I believe I proved myself last Christmas."
In the aftermath of an arson scare, Watson comments, "Wiggins is not going to be happy at a second assassin getting past his defences."