Disgruntled (2008)

How far can a man be pushed before he snaps? The staff of Logan Online Publishing finds out on one terrifying night in the office. On the day Matt McClaine gets fired, he exacts his bloody revenge on anyone unlucky enough to be working late. From his superiors to his co-workers no one will be spared Matt's enraged quest for justice. In the case of this online publishing company, firing one disgruntled person means having to re-staff an entire office.