Amazing. I wonder whatever gave him the idea.

6 seconds sound clip from the White Christmas (1954) movie soundboard.

You can hear this line at 00:19:27 in the Blu-ray version of the movie.

Quote context

[...]

- Bob Wallace and Phil Davis are out front to catch your act.

- Wallace and Davis?

- Yeah, they got a letter from your brother. He asked them to take a look and give you some advice.

- Come on now. You'd better hurry.

- Isn't that fabulous? Wallace and Davis here to see us.

- Yeah, fabulous.

- Who'd have thought that of Benny, huh? What a brother! What a sweet, wonderful guy!

- Amazing. I wonder whatever gave him the idea.

- Well, he probably knew we were here, you know, and that they were in town with the big show.

- He probably figured we were too shy to take advantage of an old Army friendship to call...

- Judy, did you read Mother's letter this morning?

- No. Why?

[...]