"An Unbreakable Vow?" said Ron, looking stunned. "Nah, he can't have... Are you sure?"[br]"Yes, I'm sure," said Harry. "Why what does it mean?"[br]"Well, you can't break an Unbreakable Vow..."[br]"I'd worked that much out for myself, funnily enough."
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"The Leaky Song" by Brad Mehlenbacher of Draco and the Malfoys