This is a knife from the 2009 horror film The Collector. In the film, Arkin (Josh Stewart) attempts to rob a house only to discover that it’s been booby trapped by a torturous killer, the Collector (Juan Fernandez). Knives were hanging from all the chandeliers in the Chase’s house. Rigged with cables, these chandeliers would fall on victims. In scenes that did not require a slowed close-up cardboard knives like these were used.