That's the finest specimen of a Mongolian disappearing chicken ever I saw.

5 seconds sound clip from the Foghorn Leghorn - Pullet Surprise (1997) Warner Bros. Merrie Melodies theatrical short.

You can hear this line at 00:04:39.478 in the DVD version of the film.

Quote context

[...]

- Huh? Oh, I'm sorry, I mean... I'm sorry, I was just taking a little stroll.

- Well, just, I say, well, just look out next time.

- Thanks a lot, Mr. Chicken, I will!

- Crazy hen walking around with her eyes closed.

- Well, pluck my feathers and call me Beulah.

- That's the finest specimen of a Mongolian disappearing chicken ever I saw.

- What's Mongolian?

- What am I, your math teacher?

- Sir, you are seemingly oblivious to the majestic creature you hold before you.

- Well, just look at those tender thighs, those juicy wings. That poultry must be 30 pounds!

- Well, you just learned lesson number one about the Mongolian disappearing chicken: you can't eat it until it reappears.

[...]