Pour hot liquid into this officially licensed wacky races morphing mugs heat-sensitive mug and snickering Muttley appears with dick dastardly in the background, ready for a race. The exterior of this officially licensed mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. The exterior of this officially licensed mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. While this mug may be used in the dishwasher or microwave, for the longest-lasting, highest quality product, strongly recommend against it. Please do not microwave this mug. Hand washes only. Due to the need for the hot liquid to transform the mug, this mug might not be suitable for young children.
