Not until I've proved it to myself and to you.
5 seconds sound clip from the Attack of the 50 Foot Woman (1958) movie soundboard.
You can hear this line at 00:23:58 in the Blu-ray version of the movie.
Quote context
[...]
- Jess, get the car. I'm going out into the desert and find that thing, and you're going with me.
- Well, don't just stand there. Go on.
- You're being ridiculous, Nancy. There's nothing out there.
- 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.
- Then I'm crazy and should be committed.
- The car's out in front, ma'am.
[...]