- All right, Schultz, who's giving it to you? Which one of us is it?
- Which one of you is what?
- Which one of us is the informer?

4 seconds sound clip from the Stalag 17 movie soundboard.

You can hear this line at 00:34:10.031 in the Blu-ray version of the movie.

Quote context

[...]

- Cut out the guff, Schulz. We're on to you. You know everything that's happening in this barracks. Who's tipping you off?

- Tipping me off? I do not understand.

- You're wasting your time, Duke.

- Come on, everybody! Outside! Let's get it over with!

- Oh, just a second, Hoffy. Schulz says he's our best friend here. Maybe he can give us a hint.

- Come on, Schulz, spill it. How'd you get the information? About Manfredi and Johnson? About the stove in the tunnel?

- All right, Schultz, who's giving it to you? Which one of us is it?

- Which one of you is what?

- Which one of us is the informer?

- Are you trying to say that one American would inform on another American?

- That's the general idea. Only it's not so general as far as I'm concerned.

- Now you are talking crazy!

- It's no use. You might as well come clean. Why don't you just tell them it's me, because I'm really the illegitimate son of Hitler.

- And after the Germans win the war you're gonna make me the gauleiter of Zinzinnati!

[...]