Haynes heat changing mug. When cold, the mug shows a Supermarine Spitfire flying over a countryside landscape with the words '1936 onwards.  When hot liquid is poured in, the mug transforms - the countryside landscape and the body of the Spitfire disappear to reveal the Spitfire in the anatomical sketch style that Haynes are known for. Once the drink is finished the mug returns to its original state as it cools.