I tell you, we were merely talking. The moment I mentioned Santa Claus - the moment I attacked his delusion - he became violent.

9 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 00:54:55 in the Blu-ray version of the movie.

Quote context

[...]

- Ow!

- Kris?

- Mr. Sawyer! Mr. Sawyer, are you all right?

- Look at that bump! He's unconscious. Better get a wet towel.

- No, better get a doctor.

- You must have done something to him.

- I tell you, we were merely talking. The moment I mentioned Santa Claus - the moment I attacked his delusion - he became violent.

- I told you he had latent maniacal tendencies. Well, I think this prove... proves it.

- Maybe we'd better have Dr. Pierce give him another examination.

- He doesn't know anything about this sort of thing. He's a general practitioner.

- You must admit, this is rather serious. Perhaps we'd better get a competent psychiatrist.

[...]