“The best horror flick in years!” “A classic!” “A masterpiece!” “A great piece of filmmaking!” Fourteen years ago, the raves came fast and furious for Bong Joon-ho’s third feature—a thrilling and funny monster movie in which a family battles a mutant creature that rises from a polluted river and carries off a teenager. Song Kang-ho stars. Subtitles. 120 min.