On Dave's recommendation. A J. J. Abrams effort from 2011. I remember reading Dana Stevens's review at the time and deciding to give it a miss; she sharply concludes with:
As a director, Abrams has at least one lesson to learn from the film crew of middle-schoolers which he created: Keep it simple. The Case, their no-budget zombie flick that plays out in its entirety over the closing credits, is so funny and sharply observed, it makes the multi-million-dollar spectacle that came before look like amateur hour.
The story arc focussing on the kids is fun, the adult stuff less so as it amounts to little more than generic menance.