"I think you will find, Watson, that not only have I familiarized myself with the area immediately outside our humble abode, my knowledge has extended to a considerably wider radius of the surrounding boroughs."

One gloved hand (the gloves are, in fact, Watson's, though Holmes wonders how long it will take for his companion to take note of it) reaches up to adjust the placement of his hat as he strolls out the door and into the cab behind the other man.