Columbine-inspired films have become a small industry in recent years, with movies like Elephant and American Yearbook cranking out at a solid clip.

Zero Day is another entry into this budding genre, and it's a quite good one, comprising the video diary of two troubled teens (Calvin Robertson and Andre Keuck) who methodically plan and carry out a rampage at their highschool. The story's (unfortunately) familiar now, but the execution here is innovative.

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