I've already told you, Doctor.
4 seconds sound clip from the The Time Machine (1960) movie soundboard.
You can hear this line at 00:11:05 in the Blu-ray version of the movie.
Quote context
[...]
- This is only a small experimental model. To carry a man, a larger edition is needed.
- Into the past or into the future.
- All right, now you've had your little joke. Suppose you tell us what this contraption is really for.
- I've already told you, Doctor.
- The future's already there. It's irrevocable and cannot be changed.
- I wonder. That is the most important question to which I hope to find an answer.
[...]