This magical Harry Potter heat changing latte mug is sure to cast a magic spell over your morning brew. Cold, the mug shows the Avada Kedavra spell - the Killing Curse - and Voldemort's Dark Mark. When hot liquid is poured in, the mug transforms to reveal Lord Voldemort himself casting the spell. Once the drink is finished the mug returns to its original state as it cools. An essential for any Harry Potter fan.