Like, don't look behind you Scoob! Pour hot liquid into the Scooby-Doo Cartoon Scooby Sleuth Heat-Sensitive Morphing Mug and the most adorable detective 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 Scooby-Doo. Hand wash only. Not dishwasher safe. Do not microwave.