Harry Potter - Marauders Map Heat Change Mug
The Marauder's Map was a magical document that reveals all of Hogwarts School of Witchcraft and Wizardry, meaning the holder can go through every inch of the ground including the secret passages. It also displays all the people on the grounds.
Half Moon Bay have used all their wizarding skills to create this mug that, believe it or not, changes when there is a hot beverage on the insidemagical. Great for any Harry Potter fan or person who is up to no good.