In the 1983 film "WarGames", Matthew Broderick's character (David Lightman), a teenage computer whiz, hacks into what he thinks is a computer video game company to play some fun games. Lightman correctly guessed that the backdoor password to the system was Joshua, the name of the deceased son of the games’ programmer.

It turns out that what Lightman really hacked into was the North American Aerospace Defense Command's (AKA NORAD), the War Operation Plan Response (WOPR) computer, and the game of Global Thermonuclear War. What he starts with his actions almost results in World War III.

It was good to learn that the film's story and WOPR were just fictional. At the time, WOPR was really made of plywood and powered for the movie by an Apple II.

"WarGames", a 1983 American science fiction techno-thriller film, was written by Lawrence Lasker and Walter F. Parkes and directed by John Badham. The film, which stars Broderick, Dabney Coleman, John Wood, and Ally Sheedy, follows a young hacker (Broderick) who unwittingly accesses a United States military supercomputer programmed to simulate, predict, and execute nuclear war against the Soviet Union.

More Info: en.wikipedia.org