Disgruntled(2008)

And you thought YOUR job was killing you.

Disgruntled is a dark revenge thriller about Matt McClaine, a man who snaps after being fired and launches a brutal rampage through his office building. With no regard for who stands in his way—bosses, colleagues, anyone working late—Matt pursues a violent reckoning against the company that wronged him. What begins as a single termination spirals into a bloodbath that forces the organization to completely rebuild its workforce. The film explores themes of workplace rage and desperation with unflinching intensity, following one man's descent into murderous chaos as he systematically targets everyone in his path. A visceral examination of how far someone will go when pushed to the breaking point.