I don't know! I don't know.
4 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 01:33:59 in the Blu-ray version of the movie.
Quote context
[...]
- He bought it with the money he got making the movie.
- There twixt heaven and earth suspended as the bell swung to and fro, and her heart...
- Good heavens! What have you done now?
- There, now, calm down. You know you have to tell me. I-I can't fix it unless I know...
- I don't know what I did! I don't know. It's your machine, not mine.
- Is this thing supposed to be smoldering?
- Don't you touch that machine.
- Now, now, stop crying. Crying won't help it just because you made a stupid mistake.
[...]