10. The Terrible Disguises
When Sherlock and the Twelfth Doctor perform a generous act or sport a gracious smile, it is usually with a manipulative agenda in mind. When either tries to censor their commentary before verbalising it, the biting remark usually forces its way free of their conscience. Thus, when they want to be very inconspicuous, they achieve the exact opposite. During The Caretaker, the Doctor cryptically notifies Clara that hes going under "deep cover". By deep cover, he means exchanging his navy jacket for a brown one, carrying a broomstick instead of a screwdriver and giving a "general wink" that is absolutely
not directed at Coal Hill's egomaniac English teacher. The case of the Bloody Guardsmen confounded many, but perhaps the most disconcerting piece of information was how Sherlock bypassed the numerous guards on duty (and found a spare moment to ruffle his hair in the meantime). By somehow acquiring a guardsman's busby, Sherlock marches mechanically alongside the other ornately-garbed officers, still wearing his cherished trench coat, accentuated by the ever-present knit scarf. At least one of the guardsmen should have been able to deduce that a fraud was among their ranks (besides Sherlock, obviously).