Famine (2011)

Thirty students. Twenty-four hours. Zero survivors.

Two years after a high-school prank involving flesh-eating acid nearly kills popular teacher Mr. Balszack, the graduating class of Sloppy Secondary holds a ’24-Hour Famine’ charity event on school grounds. But there’s an uninvited guest at this event, masquerading as the school’s handyman mascot, and he’s got an insatiable hunger of his own.