Sip in to something comfy when you savor your morning brew in this charming, color-changing mug. The Harry Potter cup features a faceted design of the Hogwarts School of Witchcraft and Wizardry crest and shiny gold star accents. The front of the black and green mug shows all four house mascots - lion, raven, badger and snake - while the back of the mug magically displays the iconic Slytherin house mascot in a raised, hissing pose when you add hot liquid inside.