Well, I think you'd better go now.
4 seconds sound clip from the The Doctor Prescribed Death (Suspense) classic radio play.
You can hear this line at 00:17:04 in the radio play.
Quote context
[...]
- I just wanted you to know that you weren't so slick.
- I wanted you to know that I knew about the blonde, but I knew you'd lied...
- Now that you've told me, what good does it to you?
- First I thought you came here for money.
- How could you think such a thing?
- Well, I think you'd better go now.
- I'm going. Goodbye, Martin. And good luck in your new venture.
- Gladys!
[...]