Vatican Cameos!! (What It Means)

"Battle stations. Someone's going to die."
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FIRST ORDER OF FANLING-BUSINESS: The giveaway still has a few hours left, so if you haven't entered for the Sherlock poster, now's your last chance.

SECOND: The origin of “Vatican Cameos” is kinda confusing.

Some say that in WWII the phrase “Vatican Cameos” was used when a person who wasn't in the British Army came before a General or other high-ranking officer as a signal that the person in question was armed. It’s a code Sherlock knew John would know, being a soldier and all.

Others say that "Vatican Cameos" is a reference to an unknown case Sir Arthur Conan Doyle briefly mentioned during The Hound of the Baskervilles. The quote sayth:

"I was exceedingly preoccupied by that little affair of the Vatican cameos, and in my anxiety to oblige the Pope I lost touch with several interesting English cases."

Interestingly, it's also been said that those who used the phrase in WWII picked it up from Sir Arthur Conan Doyle.

Either way, it's one of those things that Mofftiss (Moffat/Gatiss) put in for the hard-core fans.

And I know we're tripping over ourselves trying to figure it out and Mofftiss is just siting in their dungeon laughing. 

Kinda like this, yeah.
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THIRD: I need to know what you want me to write about. I could write the best post in the world about... Pandas. But if you don't care 'bout Pandas, it doesn't matter. So make like the "Spice Girls" and tell me what you want, what you really, really want. (Also people who comment "Zig a-Zig ah" will be high-5ed and slapped.)