Harry Potter and the Prisoner of Azkaban

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Mischief managed!

— Marauder's Map closing incantation

A boy under a shimmering cloak holds open an old parchment map in a moonlit stone corridor beside a suit of armour. — Original artwork

Mischief managed!

Marauder's Map closing incantation

A boy crouches over an old parchment map whose ink glows to life on the flagstones of a dark castle corridor. — Original artwork

I solemnly swear that I am up to no good.

Marauder's Map activation phrase