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The marauders we're walking around the black lake and suddenly James stops and points to a tree. Under the tree sat a grey and black cat, basking in the sun. Sirius turns into his Animagi form and sneaks up on the cat, barking as he jumped out of a bush. With a loud poof! The cat transforms into Professor McGonagall who proceeds to shout
"BOO!"
Sirius runs away tail between his legs, the other Marauders laughing hysterically from a distance.

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