This Mr. Men Little Miss heat changing mug is sure to get your morning off to a happy start. Cold, the mug shows a classic Roger Hargreaves illustration of Mr. Happy against a black background, with the word, "Happy" on the reverse. When hot liquid is poured in, the black background transforms to a brilliant yellow as well as a series of rainbows and the name, "Mr. Happy". The back changes to reveal the phrase, "Think happy thoughts". Once the drink is finished the mug returns to its original state as it cools. Packaged in a printed gift box, it makes a lovely gift for any Mr. Men Little Miss fan.