With season four of Game of Thrones coming out in April, 2014, Warner Brothers Home Entertainment is preparing for the DVD release of the previous season with this White Walker publicity stunt.
The stunt is located in Sweden, where weather conditions are eerily similar to those found in the northern territories of the fictional Game of Thrones world. At various checkpoints a wooden glass box was placed with a knife inside and a sign underneath reading "In Case of White Walkers: Break Glass." This hilarious reference is the perfect way to give fans a chuckle and promote the release of season three on DVD. The question is, how many fans actually took this advice and shattered the outer casing of the box to retrieve the knife inside?