Idle Hands is a 1999 comedy/horror movie starring Devon Sawa, Seth Green, and Jessica Alba
with Elden Henson and Vivica A. Fox. It follows the life of a teen whose hand becomes possessed and goes on a killing spree, even after being cut off from his arm. The film was delayed in its release because of the Columbine massacre.
Anton is a teenage stoner who, one Halloween season, realizes two days after the fact that his parents have been beheaded. He is even more disturbed to learn that the culprit may be his recently demon-possessed hand. With the help of some fellow young drug abusers, some sharp objects (used to disembody several body parts), and a demon hunter (Viveca A. Fox), he may possibly restore some normalcy to his life.