That's the darndest-looking cucumber you'll ever see.
4 seconds sound clip from the Deliverance (1972) movie soundboard.
You can hear this line at 01:36:52 in the Blu-ray version of the movie.
Quote context
[...]
- This corn is special, isn't it?
- Boy, this corn. I love good corn.
- We need that big cucumber I got out of the garden last night.
- 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.
[...]