A friend of mine shared a fan theory about the Series 4 finale of Sherlock. Basically, the theory was that Sherlock had spent all or most of S4 inside of his Mind Palace. I hated this idea, mainly because “It was all a dream” is one of the lamest ways to end a story imaginable. And besides, Sherlock has gone to that well once before. Two dream endings in one series would really be pushing it.
Now, I’m kind of wishing that they went with it.