Joon-ho Bong’s Snowpiercer is a grimy and dismal vision of the future. There’s nothing cheery about a post-apocalyptic future, and if living has more in common with being a prisoner of war (cramped conditions, no windows, questionably non-descript food) it might not be worth struggling for survival. But it’s not all doom and gloom. True, this is about preserving the last souls on Earth, but it’s not without a handful of wacky Korean conventions that few aside from Joon-ho Bong can provide with such style and balance. Even as the last hope for humanity speeds its way through our now frozen planet, there’s still time for humor peppering a multitude…