I'll never be happier, Mr. Dowd. I know it.

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

You can hear this line at 01:31:12.134 in the Blu-ray version of the movie.

Quote context

[...]

- Uh-huh. I plan to leave, you want me to stay. An element of conflict in any discussion is a very good thing. Shows everybody's taking part and nobody is left out. I like that.

- Ah, Miss Kelly. Miss Kelly, you know, when you wear my flower, you make it beautiful.

- A diviner grace has never brightened this enchanting face. Ovid's Fifth Elegy.

- Ovid's always been my favorite poet.

- My dear, you'll never look lovelier.

- I'll never be happier, Mr. Dowd. I know it.

- Hey, this rabbit gag must be a good one.

- Mr. Dowd, I have a formula, 9-7-7, that will be good for you. Will you take it?

- 9-7-7?

- Yes. It's a serum.

- You won't see this rabbit anymore.

- But you will see your responsibilities and your duties.

- Uh-huh. Well, Doctor, if you thought of this, I'm sure it must be a very fine thing. And if I happen to run into anybody who needs it, I'd be glad to recommend it. But as for myself, I don't think I'd care for it.

- You hear that, Judge? You hear that, Doctor? That's what we have to put up with.

[...]