Don't be foolish. If it's true, they'll have to accept it.
6 seconds sound clip from the Planet of the Apes (1968) movie soundboard.
You can hear this line at 00:51:14 in the Blu-ray version of the movie.
Quote context
[...]
- No creature can survive in the Forbidden Zone. I know. I've been there. I've seen it.
- Then how do you account for me?
- I don't. And I'm not going to try.
- But what about your theory? The existence of someone like Taylor might prove it.
- Zira, do you want to get my head chopped off?
- Don't be foolish. If it's true, they'll have to accept it.
- Oh. Cornelius has developed the most brilliant hypothesis...
- The ape evolved from a lower order of primate, possibly man.
- In his trip to the Forbidden Zone, he discovered traces of a culture older than recorded time.
[...]