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Merry Christmas! If you hear scuffling on your roof in the wee hours of this morning, it's probably just Santa Claus.
If it's accompanied by a low thumping sound, though, it may not be the hoof beats of Prancer, Donner and Vixen and could be the muffled blades of a black helicopter dropping United Nations storm troopers onto your rooftop bent on collectivizing your root vegetables.