That cucumber is a terrapin.
4 seconds sound clip from the Deliverance (1972) movie soundboard.
You can hear this line at 01:37:01 in the Blu-ray version of the movie.
Quote context
[...]
- Tell me.
- Twelve and a half inches long. Then I measured it around, and it's 10 and a half around.
- That's the darndest-looking cucumber you'll ever see.
- I tell you, I'll send it over and let you see it if you doubt it.
- That cucumber is a terrapin.
- Now, I know where you told me it was.
- Well, uh, we just wanna cooperate.
- You recognize that piece of canoe over there?
[...]