Very sorry, but you see, no rats.
5 seconds sound clip from the The Exorcist movie soundboard.
You can hear this line at 00:30:59 in the Blu-ray version of the movie.
Quote context
[...]
- Jesus.
- Oh, Karl. Jesus Christ, Karl, don't do that.
- Very sorry, but you see, no rats.
- No rats. Thanks a lot. That's terrific.
- Okay. Unroll your fist. Arm up.
- Very good. That wasn't so bad, was it?
[...]