Bad Sign™ Color Morphing Coffee Mug – Funny Heat-Reveal Mug, 11oz

Sometimes the signs are subtle. This one really isn’t.

The Bad Sign™ Color Morphing Coffee Mug adds a little dark humor to your morning coffee with a stick-figure design heading straight past a very obvious BAD sign and the perfectly understated caption, “Well, that’s not a good sign.”

The best part? The joke doesn’t appear right away. When the mug is cool, its exterior is black, keeping the artwork concealed. Pour in your favorite hot coffee, tea, cocoa, or other warm drink and the heat-reactive surface begins to transform, gradually revealing the Bad Sign™ design underneath.

It’s a fun desk mug, conversation starter, and unexpected gift for anyone who appreciates sarcasm, questionable decisions, impending disaster, or watching someone completely ignore the warning signs.

Why You'll Love It

• Heat-reactive magic: Black exterior transforms as the mug warms, revealing the hidden design
• Funny Bad Sign™ artwork: A simple stick-figure illustration paired with dry, relatable humor
• 11oz capacity: Just right for coffee, tea, cocoa, and other hot drinks
• Glossy ceramic finish: Smooth, polished appearance when hot or cold
• Comfortable C-shaped handle: Designed for a sturdy, comfortable grip
• Lead and BPA-free
• White ceramic interior

Product Details

• Size: 11oz (0.33 L)
• Material: Ceramic
• Cold appearance: Black exterior with white interior
• Heat-reactive printed surface
• Glossy finish
• C-shaped handle
• Lead and BPA-free
• Hand wash recommended to help preserve the color-changing effect

Please note: The mug must be filled with a sufficiently hot beverage for the artwork to become visible. As the mug cools, the exterior gradually returns to black and conceals the design again.