- And if it isn't?
- Then I'm crazy and should be committed.

10 seconds sound clip from the Attack of the 50 Foot Woman (1958) movie soundboard.

You can hear this line at 00:24:11 in the Blu-ray version of the movie.

Quote context

[...]

- You don't believe me? Well, you're wrong. You're all wrong.

- And you're drunk, Nancy. Why don't you try to sleep it off?

- Not until I've proved it to myself and to you.

- We'll drive on the side roads.

- I have a strange feeling it's out there somewhere, waiting for me. I'm certain of it.

- And if it isn't?

- Then I'm crazy and should be committed.

- The car's out in front, ma'am.

- Jess, get the revolver.

- What's the gun for?

- We're going hunting, remember? Let's go.

- Nothing. Just sand and space. Well, seen enough?

[...]