Other's Explanations
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Voldemort had given the dementors free swimming lessons
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It's swimming day, at the Paul Bunyan Family reunion.
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How can she light a bomb in water?
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Next thing I know, a water ninja comes and grabs Ackbar
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that's one sexy swim suit
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There you are, having fun with your family when a fucking ninja comes from under the water and kills everyone.
Voldemort had given the dementors free swimming lessons