Celebrate the Batman: Arkham Origins video game with this totally awesome mug from the game! This Batman Arkham Origins The Joker Morphing Mug starts out black, but then the grinning Joker is revealed when the mug heats up! This great 11 oz. mug transform from black as hot liquid is added. Watch as the heat-activated process reveals the hidden image in full vivid colors! Not dishwasher or microwave safe.