Thanks, Die Hard. That movie is basically Patient Zero for this phenomenon. And yes, it's an action flick set at a corporate holiday party, with a soundtrack full of carols and a Now I Have A Machine Gun Ho-Ho-Ho taunt from the good guy. Die Hard counts as a Christmas movie. Case closed. But there are other even more borderline cases. Let's consider these as unusual contributions to the holiday-movie-watching season, or as fodder for your next online brawl or in-person family dinner argument.