Well! That's quite a change in you. It's amazing what one letter can do.

— Alfred Kralik (James Stewart)

5 seconds sound clip from the The Shop Around the Corner (1940) movie soundboard.

You can hear this line at 01:13:39.954 in the Blu-ray version of the movie.

Quote context

[...]

- I hope it's good news.

- I'll tell you later.

- Oh. Well, Mr. Kralik it certainly was kind of you to drop in. But I don't wanna spoil your whole evening.

- I have nothing to do.

- No. Go right ahead and read the letter. Don't, don't worry about me. If you don't mind.

- No, not at all.

- Good news?

- Very good news.

- I can promise you I'll be back in the shop tomorrow and I'll be on my toes! I'll sell more goods than I ever sold before.

- Well! That's quite a change in you. It's amazing what one letter can do.

- You know, if I weren't feeling so happy I'd be very annoyed with you.

- With me?

- Why? Why? Because you really spoiled my date last night.

- You see, I wasn't so wrong when I asked you not to sit at my table. This gentleman did come to the cafe. He looked in the window, saw us together and misunderstood.

- Oh, you mean he thought you and I were friends?

- He must have. Listen.

- Tell me and be frank. I think you owe it to me. Who is this very attractive young man? He's just the type women fall for.

- I'm sorry I caused you so much trouble.

[...]