May I ask what earthquake caused your mind to work at last?

— Richard Hannay (Robert Montgomery)

5 seconds sound clip from the The 39 Steps (1937) classic radio play.

You can hear this line at 00:45:32 in the radio play.

Quote context

[...]

- Say, what's wrong with you?

- Oh, nothing that I know of.

- Oh, you mean my shoes? Yes, they're rather large, aren't they? I borrowed them from the innkeeper's wife.

- Oh, no, no, no, it's not the shoes. Why are you being so nice? You don't feel ill or anything, do you?

- No. Why should I?

- Why didn't you leave? You were very anxious to, if I remember correctly.

- Well, something happened last night that convinced me you've been telling the truth.

- May I ask what earthquake caused your mind to work at last?

- When I got free, I went downstairs. That car you said I imagined belonged to our pursuers. It was sitting downstairs when I got there.

- Did they see you?

- No, I hid behind the counter.

- They asked the innkeeper about us.

- What did he say?

- Said he hadn't seen us.

- Then they ordered something to eat, and while they were eating, they talked a lot about, er... Oh, about the Thirty-Nine Steps.

[...]