"Three. Extremes" collects directors from Hong Kong, Korea and Japan to make horror films, each about 40 minutes long. The device was common in Europe in the 1960s, where movies like "Boccaccio '70" set assorted directors loose on a vaguely-related theme. Here the theme is horror, and by horror I don't mean the Hollywood routine of shock, blood and special effects. These films are deeply, profoundly creepy.