Listen, both of you. There are no such things as dragons. What you saw was something that looked like one. I'm trying to think what it was.
10 seconds sound clip from the Dr. No movie soundboard.
You can hear this line at 01:07:22 in the Blu-ray version of the movie.
Quote context
[...]
- I told you there was something wrong about this place.
- That was a machine gun, not a dragon.
- Yes, I have. He had two great, glaring eyes, short tail and pointed wings. He was breathing fire.
- You don't believe me, do you?
- I tell you, Mr. Bond. Let's get the hell out of here.
- How do you know there aren't? Anyhow what do you know about animals?
- I hate to admit it, but I haven't.
[...]