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When you pour in a hot drink, it turns from "I Solemnly Swear That I Am Up To No Good" to "Mischief Managed." In addition, the 11-ounce mug also also turns from black to white, completing the transformation....UMM AWESOME. I. NEED. THIS.

from Etsy

WE DO GEEK 16x24in Wood Sign

Hey, I found this really awesome Etsy listing at

I will never not think this is hilarious. (Mug by @nicoleleighshaw & @RobynHTV) A Poem For Coffee Mornings Funny Classic White Coffee Mug