- Useful? You, Tracy? Why, I'm going to build you an ivory tower with my own two hands.
- Like fun you are.
- Do you mean you've been in one too long?

12 seconds sound clip from the The Philadelphia Story movie soundboard.

You can hear this line at 00:49:30 in the Blu-ray version of the movie.

Quote context

[...]

- Look what your friend considers a wedding present.

- Why, it's a model of the True Love.

- The what?

- A boat he designed and built, practically.

- We sailed her down the coast of Maine and back the summer we were married. My, she was yare.

- Yare?

- What's that mean? It means, uh... Oh, what does it mean? Easy to handle, quick to the helm, fast, bright. Everything a boat should be. Until she develops dry rot.

- Oh, George, to get away, somehow to be useful in the world.

- Useful? You, Tracy? Why, I'm going to build you an ivory tower with my own two hands.

- Like fun you are.

- Do you mean you've been in one too long?

- Well... I mean that, and a lot of things.

- You know, we're gonna represent something, Tracy, you and I and our home. Something straight and sound and fine. Then perhaps your friend, Mr. Haven, will be somewhat less condescending.

- George. You... You don't really mind him, do you? I mean, the fact of him?

- The fact of him? What do you mean?

- Well, I mean... Well, you know, that he ever was my lord and master, that we ever were...

[...]