I loved this scene, because Sherlock did what I always wish I could do: mercilessly correct people's grammar. (Un?) Fortunately I'm not a high-functioning sociopath, so it would be unacceptable for me to do this.
The terrifying thing is I had barely glanced at this and knew what it was and to whom each pair of shoes belonged. Split second analysis worthy of Sherlock himself ;) Starting at the top and going clockwise: John, Mycroft, and Sherlock.