A 'Game of Thrones' fan theory about Bran Stark is spreading like crazy -- but it overlooks 3 key things

HBO Warning: Spoilers ahead for "Game of Thrones" season seven. Fan theories are a staple of the "Game of Thrones" community, but every now and again an idea sparks without a whole lot of hard evidence to back it up. The latest in this craze of hypotheticals is a theory stating that Bran Stark is really the Night King. While it might be an interesting notion, people should probably set aside their tinfoil hats for a moment and consider the facts.First, I'll give an overview of the theory — the...