There's nothing.

3 seconds sound clip from the The Exorcist movie soundboard.

You can hear this line at 00:30:52 in the Blu-ray version of the movie.

Quote context

[...]

- What are you doing here?

- My bed was shaking. I can't get to sleep.

- Oh, honey.

- Goddamn it.

- Jesus.

- There's nothing.

- Oh, Karl. Jesus Christ, Karl, don't do that.

- Very sorry, but you see, no rats.

- No rats. Thanks a lot. That's terrific.

(church bells ringing)

[...]