"Which side are you on, son?" Pour hot liquid into this Full Metal Jacket Born to Kill Heat-Sensitive Morphing Mug and Private Joker's helmet appears. The exterior of this 11 oz. mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. Makes a great gift for fans of the movie Full Metal Jacket. Hand wash only. Not dishwasher safe. Do not microwave.