It's a bluff, John. Call it off.
4 seconds sound clip from the WarGames (1983) movie soundboard.
You can hear this line at 01:34:18 in the Blu-ray version of the movie.
Quote context
[...]
- I don't know what you think you could do here, Steven.
- John! Good to see you. I see the wife still picks your ties.
- What has this kid been telling you?
- The president's ready to order a counter-strike. That's what we're recommending he do.
- It's a bluff, John. Call it off.
- No. It's not a bluff. It's real.
- Mr. Falken, you picked a hell of a day for a visit.
- General, what you see on these screens up here is a fantasy, a computer-enhanced hallucination.
- Those blips are not real missiles. They're phantoms.
[...]