- No, no, no. No. Have him wait. Let him cool his heels a while.
- Psychology, eh?
- It never fails.

9 seconds sound clip from the You Can't Take It with You (1939) classic radio play.

You can hear this line at 00:06:24 in the radio play.

Quote context

[...]

- You can't force a man to sell his home.

- Well, what'd he say when you offered him the fifty thousand?

- I'm not sure, but I think someone began singing, someone else danced, and Grandpa Vanderhof himself sat down and played a mouth organ.

- A mouth organ? What are they, a bunch of nuts?

- Mr. Vanderhof is here, Mr. Blakely.

- Oh, Mr. Vanderhof? Well, send him right in!

- No, no, no. No. Have him wait. Let him cool his heels a while.

- Psychology, eh?

- It never fails.

- Mr. Blakely will see you in just a minute.

- Huh? Oh, that's all right. I'm not in any hurry.

- Say, Mister. What are you doing with that there machine?

- Huh? Oh. Why, this is an adding machine. Oh, my goodness, made a mistake. First time in twenty years.

[...]