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This is a mug with the quote "I solemnly swear that I am up to no good" printed on. Once the mug is filled up with a hot substance (maybe some hot butterbeer?) it changes to "Mischief Managed".
I know that both the book and movie series are finished, but this is still such a great mug.
It`s a super fun way to remember your favourite books!
They cost $16.16 and can be found at the site linked below.
Would you buy this? Are you a Harry Potter fan?