Exclusive offer at the WB Shop! The world of Harry Potter comes to life for kids, or just Harry-fans who refuse to grow up. This is a pretty cool gift whichever the case. “I Solemnly Swear That I am Up to No Good” is etched on the side of the thermal mug and when filled with something hot, it “magically” changes to “Mischief Managed” and changes from black to white. If you’re always on the lookout for Harry Potter merchandise, check out this unique piece!
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