I've got the proof here in my lens.

2 seconds sound clip from the Creature from the Black Lagoon (1954) movie soundboard.

You can hear this line at 00:39:57.946 in the Blu-ray version of the movie.

Quote context

[...]

- What makes you think we're supposed to play tag with the thing, whatever it is?

- I tell you, we can learn more from it if it's alive!

- Please, what is it that you found?

- I don't know what you'd call it.

- It sounds incredible, but it appeared to be human.

- I tell you, if it's what I think I saw, it's the greatest find yet. Nothing compares to it.

- I've got the proof here in my lens.

- Many years ago, I hear this legend on the river. A very old native tell me of a man who live underwater, but she was crazy.

- Crazy Goole, everybody called her.

- The unknown always seems unbelievable, Lucas.

- One accepts these things as legend and lets it go at that, but to actually believe that there exists something like a human being that can live underwater...

[...]