Escape from L.A.
One notable example of a net gun is used in the Predator series of films, most notably "Predator 2" and "Alien vs. Predator". This version is somewhat lethal, as it tightens around the target and cuts them like razor wire. Other examples include the films "Total Recall", "The Running Man" and "Escape from L.A.", in which a net gun is used to capture the protagonist. The net gun used in the latter two references, as well as "I, Robot" is a real item.