WARNING: Major Spoilers ahead for the Season 7 finale of Game of Thrones! Continue reading at your own risk...
While watching this scene closely, some fans think that the formation of the Night King's soldiers actually teases something big.
As the Army of the Dead marches around sections of ice and water, it looks as though they're forming the head of a wolf - the sigil of House Stark.
On one hand, this is probably nothing more than a simple coincidence. The shape isn't an exact replica of the Stark wolf, so it is a bit of a stretch.
On the other hand, this does resemble the sigil quite a bit. Why else would the show have made the soldiers march in such a specific formation?
Those who think that this was intentional are using it to prove the popular theory that Bran is the Night King, or at least connected to him. If he was controlling the army - or if they were coming after him - it could explain why the wolf appeared.
Unfortunately, we'll have to wait quite a while to find out if this has any real connection to the Starks or not, as Game of Thrones may not return until 2019.