I want to observe the expression on his face when he talks to this rabbit.

3 seconds sound clip from the Harvey (1950) movie soundboard.

You can hear this line at 01:00:25.497 in the Blu-ray version of the movie.

Quote context

[...]

- You'd better look in the bathtub. It must be a stranger.

- He says that Harvey just walked through the door. It must be a stranger in the bathtub.

- But I know where he is. He's at Charlie's Place. That's a bar over at 12th and Main.

- 12th and Main. That's two over and one down.

- Yes. Where are you going, Doctor?

- I'm going to go over and get your brother and bring him back. Take him to the sanitarium where he belongs.

- I want to observe the expression on his face when he talks to this rabbit.

- He does talk to the rabbit?

- They tell each other everything.

- Good. What?

- I said, yes, he talks to him.

- But, Doctor, don't go out there. You'll regret it if you do.

- Nonsense, Mrs. Simmons. You underestimate me.

- No, no, you underestimate my brother.

[...]