The title of Steven Spielberg's 1977 masterpiece, , is not just a catchy phrase; it is a direct reference to a scientific classification system that anchors the film’s narrative in the reality of 20th-century UFO research. The Origin: The Hynek Scale

: The highest level of encounter in Hynek's original scale, involving the sighting of actual extraterrestrial beings or "animate occupants" in or near the craft.

: A UFO sighting accompanied by physical evidence or effects, such as scorched earth, broken branches, or electromagnetic interference in vehicles and electronics.