- Yeah, well, what in the name of Fats Waller is that?
- A 4-foot prune.
- A 4-foot prune?

10 seconds sound clip from the The Muppet Movie (1979) movie soundboard.

You can hear this line at 01:18:57.039 in the Blu-ray version of the movie.

Quote context

[...]

- You see, I'm Dr. Bunsen Honeydew and this is my assistant, Beaker.

- We live here perfecting useful inventions. Come in, come in.

- Welcome to our laboratory. Please don't touch anything.

- Uh... Is this the only street into town?

- Yes, yes.

- Hey, what are you dudes doin' in here?

- I'm so glad you asked. We're perfecting our latest invention: Insta-Grow pills.

- Yeah, well, what in the name of Fats Waller is that?

- A 4-foot prune.

- A 4-foot prune?

- Yeah, man, well, what else do these pills make big?

- Oh, they work on anything, but the effect is sadly temporary.

- Sadly temporary.

- Oh, no! Hey, Kermit. Here comes Doc Hopper.

- I know. I'll be ready for him.

- Okay, Frog. Where are you?

- I'm here. I'll meet you in the middle of the street.

- Oh, yeah?

[...]