Brown, unfortunately, is not a caterpillar. He doesn't eat flowers, he devours people.
5 seconds sound clip from the The Big Combo (1955) movie soundboard.
You can hear this line at 01:09:23.452 in the Blu-ray version of the movie.
Quote context
[...]
- You feel that pretty strongly, don't you?
- I can tell you why you feel that way.
- Can you?
- I have a photograph of you... taken seven years ago. You can have it if you like.
- The men are old friends of yours, one alive, the other dead.
- Brown, unfortunately, is not a caterpillar. He doesn't eat flowers, he devours people.
- I don't want to hear any more! Please! Please, I'm sick! Can't you see I'm sick?
- I'd rather be insane and alive than sane and dead.
- If you can move it, it's not broken.
- Take a drink. I took a drink, it still hurts.
[...]