If you take public transportation to work, you've probably seen some wild things.
But have you ever come across White Walkers?
Their presence was in anticipation of the show's season 7 premiere in the United Kingdom that evening.
As icing on the cake, musicians played the show's theme song somewhere else in the station.
White Walkers aren't humans but are an ancient species of humanoids who first arrived in Westeros 8,000 years ago during the longest winter, according to Bustle. After being driven up north, these skeletal terrors continue to invade.
Thumbnail Image Credit: Flickr, Hugh Llewelyn