The Heat-Sensitive Coffee Mug from Charles and Marie is a pretty novel idea – when empty and cold, the mug will feature the word “OFF” on the front, while filling it up with a hot beverage of your choice to start off your mornings at the office will see it change color and word, with “OFF” turning to “ON” for obvious reasons. I suppose instead of splashing out $25 for this Heat-Sensitive Coffee Mug, you could always take the extra effort to see whether there is any steam rising from your drink – if the answer is in the affirmative, you’ll probably scald your tongue.
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