Growing up, my uncle had these drinking glasses that had women on them and when you put something cold in them, their bikini tops disappeared. I thought they were the most awesome thing in history in my youth because BEWBS. This coffee cup is sort of like those, only in reverse and without showing any nakey bits.

It’s called the 8-Bit Rise & Shine Heat Mug. When the mug has nothing in it or something cold it has a bleak, black sleepy face. When you put a nice hot liquid in it, the cup turns blue and has a smiley face.

It’s pretty awesome and would be a great way to tell at a glance if your coffee or hot chocolate is cold before taking a test sip. Few things are worse than a mouthful of cold hot chocolate. You can pick one up for $11.99(USD) from ThinkGeek.