I don't have to think. We didn't say anything to anybody. Not a word. Not until we hit this barracks.

5 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 01:07:12.845 in the Blu-ray version of the movie.

Quote context

[...]

- Abführen!

- We have some rights, colonel. Why is this man being taken out?

- Curtains would do wonders for this barrack. You will not get them.

- How did he ever find out about that ammunition train?

- You two must have shot your mouths off all the way from Frankfurt to here.

- No, we didn't.

- Maybe just a hint or so? Think hard.

- I don't have to think. We didn't say anything to anybody. Not a word. Not until we hit this barracks.

- What are you looking at me for?

- Lights out! Lights out! Lights out!

- I suppose some jerk's gonna say I did it.

- Why don't you try it one at a time?

[...]