Idle Hands

Idle Hands is a 1999 American stoner comedy horror film directed by Rodman Flender, written by Terri Hughes and Ron Milbauer, and starring Devon Sawa, Seth Green, Elden Henson, Jessica Alba, and Vivica A. Fox. The main plot follows the life of an average lazy stoner teenager, Anton Tobias Sawa, whose hand becomes possessed and goes on a killing spree, even after being cut off from his arm.

Lazy stoner teenager Anton Tobias parents wind up dead on Halloween, with all the clues pointing to him. After killing his best friends Pnub and Mick, Anton realizes that his right hand has become possessed. Unable to control his hand, Anton throws his cat across the street and while searching for it, he encounters his neighbor Molly and the two start a relationship. Anton holds a funeral for his parents and friends. However, Pnub and Mick decide not to go to heaven, returning to their former bodies and rising from the grave.Meanwhile, a druidic high priestess named Debi LeCure is hunting the spirit responsible for killings across the country. After his hand kills two cops in his living room, Anton cuts it off with a cleaver. Pnub and Mick seek out a FirstAid Kit while Anton traps the hand in a microwave, burning it. Meanwhile, Debi now along with Randy, Antons neighbor hunts Anton down to put a stop to the possessed hand. After sending Molly to the school dance, Anton returns home to finish off the hand. Unfortunately Pnub and Mick inadvertently release the hand. The three then steal Randys truck and head to the school. Mick and Pnub go to the Halloween dance to watch over Molly, while Anton looks for the hand. Randy and Debi meet up with Anton. Debi explains that the hand will drag Mollys soul into the netherworld. Anton crashes the dance and tries to warn everyone about his hand, but is ignored. ........

Source: Wikipedia