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I solemnly swear that I am up to no good! Words that get any Harry Potter fans excited, because they mean that Harry and his friends are about to use the Marauders Map, the map that can tell you where to go and who's there, even when they are hidden. And now with this incredible mug, you can have your very own Marauders map. All you have to do is fill the mug with hot water and watch as a map appears on the once plain mug. Mischief managed.