- Do you know what will happen to me if the bridge is not ready in time?
- I haven't the foggiest.
- I'll have to kill myself.

Colonel Saito (Sessue Hayakawa)

9 seconds sound clip from the The Bridge on the River Kwai movie soundboard.

You can hear this line at 00:55:21.202 in the Blu-ray version of the movie.

Quote context

[...]

- When I said all officers must work naturally, I never meant you, the commanding officer.

- My orders were only intended for officers below...

- None of my officers will do manual lab our.

- Please! I was about to say: I've been thinking the matter over and have decided to put majors and above on administrative duties leaving only the junior officers to lend a hand.

- I'm afraid not. The convention's quite clear on that point.

- Do you know what will happen to me if the bridge is not ready in time?

- I haven't the foggiest.

- I'll have to kill myself.

- What would you do if you were me?

- I suppose, if I were you I'd have to kill myself... Cheers.

- I warn you, colonel. If I am to die, others will die before me. Do you understand that?

- Major Clipton did mention something to that point. That won't solve your problem.

- I'm sure we can arrive at a proper solution. Please sit down.

[...]