Noboru Iguchi would seem to be in the enviable position, at least to his mostly male fan base, of doing exactly what he likes and never having to grow up. A veteran director of low-budget exploitation films, Iguchi has an unabashedly adolescent obsession with short-skirted schoolgirls, spandex-clad superheroes, blood sprays and bathroom humor. His 2012 film "Zombie Ass: Toilet of the Dead" ("Zonbi Asu") is exactly what the English title sounds like.