Found this one while surfing tvtropes Crack Fic entry. It probably belongs in Crossovers that Should Not Be, but it is and it's hilarious.
Harry Potter and the Eagle of Truthiness
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If you become a monster to put down a monster you've still got a monster running around at the end of the day and have as such not really solved the whole monster problem at all.
Harry Potter and the Eagle of Truthiness
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If you become a monster to put down a monster you've still got a monster running around at the end of the day and have as such not really solved the whole monster problem at all.