Game of Thrones Jon Snow heat changing mug is sure to get your morning off to a strong start. Cold, the mug shows Ygritte's famous quote "You know nothing Jon Snow" on the front and the Stark house sigil, a direwolf, on the back. When hot liquid is poured in, the mug transforms to reveal the house sigil in black and grey behind the quote and Jon's face appears on the back. Once the drink is finished the mug returns to its original state as it cools. An essential for any Game of Thrones fan!