The Loved Ones(2012)

To avoid a ghostly figure in the road, high-school senior Brent Mitchell crashes into a tree, killing his father. Confronted by his mother's emotional breakdown after the accident, Brent escapes his guilt by sinking into a marijuana-fuelled world of loud metal music. His only shot at happiness is with his girlfriend Holly, an attractive and caring girl who would be a dream date for the high-school prom. But his plans are thwarted by a disturbing series of events that result in Brent being the prom king at a macabre, sadistic event where he is the entertainment.