I do.
3 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.
You can hear this line at 01:15:18 in the Blu-ray version of the movie.
Quote context
[...]
- Do you believe him to be of sound mind?
- You are under oath. Do you really believe that this man is Santa Claus?
- Well, he gives every indication...
- I asked you, do you really believe that this man is Santa Claus?
- I do.
- Psychologist! Where'd you graduate from, a correspondence school? You're fired.
- Your Honor, I object to this testimony. It's ridiculous, irrelevant and immaterial.
- Mr. Gailey is making a circus out of this court.
- There is no such person as Santa Claus, and everybody knows it.
[...]