Cause everyone needs to know when their coffee mug is on or off, there is now a visual indicating On-Off Mug that reads "off" without liquid and "on" when filled with a warm bevy. A special heat-sensitive pigment will turn the mug from black to white as the temperature increases, so you not only get your morning cuppa joe, but you get a magic show as well. Each mug is dishwasher safe and costs $25. What do you think? Love or leave? 
This reminds me of a mug I used to have where the moon
would get darker and darker depending on the heat of the liquid.
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That is so chic! Everyone at work would love it haha!
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