The Hot Cold Mug looks like your ordinary black mug with the word “cold” written in white. However, once you fill the Hot Cold Mug with a hot liquid, the mug suddenly changes color from black to white with the word “hot” written in black. Pretty cool, right? I don’t know why anyone would wanna by one of these, unless you plan on showing them off to your office mates. At $25 a pop, I think I’ll pass. Plus, I always know whether I’m drinking something hot or cold. I don’t need a mug telling me. I’m no idiot…

Get the Hot Cold Mug at Charles & Marie.

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Via: Boing Boing Gadgets