Two halves of the Sherlock fandom. I first saw the whole sadness and happiness about the fact that Sherlock is going to come back to John. Then I saw the moustache. and I imagined what Sherlock would think about that.
This is actually why I think JohnLock might be a thing: John just jokingly mentions it so often. And when six out of seven of your closest acquaintences think something is going on, plus enough random strangers to choke a horse, yeah.