Actually, if we hadn't caught it in time, it might have gone to DEFCON 1.
5 seconds sound clip from the WarGames (1983) movie soundboard.
You can hear this line at 00:57:51 in the Blu-ray version of the movie.
Quote context
[...]
- This machine over here runs his game program.
- See that sign up here? Up here?
- Yeah.
- DEFCON? That indicates our current defense condition.
- It should read DEFCON 5, which means peace. It's still on 4 because of that little stunt you pulled.
- Actually, if we hadn't caught it in time, it might have gone to DEFCON 1.
- Do you know what that means, David?
- Wow. (2)
- You say you broke into our system just to play a game, right?
- Right. That's right. That's exactly right.
[...]