HotCold Mug reveals the temperature of your drink
Check out this HotCold Mug version from the makers of the Onoff Mug which uses a heat sensitive pigment to visually show the temperature of your chosen beverage.
At plain sight it is a standard black mug as they come a dime a dozen and in big white letters it say COLD. Nothing fancy, but once you add the hot beverage of your choice, the mug changes color and is turning white and in big black letters it states: HOT and its Dishwasher safe of course!

Can be purchased here for $25 about £12

Can be bought here in the uk: http://www.lazyboneuk.com/products/Hot-Cold-Mug-%252d-Heat-Sensitive-.html
Now I don’t mean to bash this product, it’s actually pretty cool, but in the second image, does anyone notice how it says “Old ho”?