"You can open it if you like," said Harry, "but I'll hear what it says anyway. That's a Howler."[br]"Let go of it, Petunia!" roared Uncle Vernon. "Don't touch it, it could be dangerous!"[br]"It's addressed to me," said Aunt Petunia in a shaking voice.
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"The Leaky Song" by Brad Mehlenbacher of Draco and the Malfoys