Boy Kills World is the perfect example: A pulpy, ultra-violent martial arts actioner. But where does the fun kind of overstimulation tip over into the exhausting kind? About 40 minutes into this 110-minute film, as it turns out. The product of an international coalition of overgrown adolescents – made in South Africa by a German director. At times, it plays like a hyperactive tribute to the 1973 Japanese classic Lady Snowblood, in which a mute orphan undergoes