Jet Gameplay
Look at the corners of the screen respectively. The vignette filter is subtle at the beginning and "grows" into the screen once the action starts to ramp up creating an artificial feeling of tunnel vision. (instead of using lense shifting ) at around 8:40 the effect is just retarded.
Good vignetting can add a selected highlight to a scene, while when done poorly only decreases image quality by creating a round tunnel field of view that is comparable to the loss of lateral vision from a starting migraine.