Famine also known as Stupid Teens Must Die is a 2011 horror film written and directed by Ryan Nicholson, and cowritten by Jeff OBrien.
Before the famine begins, Katie hides food in one of the gym washrooms, and while doing so is confronted by someone wearing the costume of the school mascot, a carpenter called The Nailer. The Nailer throws a knife into Katies forehead, and hides her body. Hours later, with the famine in full swing, The Nailer picks off straggling students. Terry has his throat slit while sabotaging food in the cafeteria, Peterson is impaled through the head while having sex with a Swiss Roll, and Vanessa is thrown onto the spike protruding from Petersons head.After she finds the Nazi principal dead, his eyes removed while he was watching gay porn, Jenny is kicked out, her claims disbelieved. Jenny reenters the building using keys she takes off the bodies of two teachers murdered in the parking lot, and discovers Darrens fried and severed head in the cafeteria freezer. Jenny rejoins Vickers and the remaining students in the gym, just as a distorted voice begins making threats over the PA system. Everyone except Cathy flee into the school, finding the dead body of Tim the scarred janitor and prime suspect in an office. ........
Source: Wikipedia