Honey, you're making a big mistake. This is a very intelligent horse.
5 seconds sound clip from the Mister Ed movie soundboard.
You can hear this line at 00:06:45 in the DVD version of the movie.
Quote context
[...]
- Ah, let's get started with the feet now, huh?
- Maybe it's just hot in here. Should open a window.
- This is my husband, Wilbur, and that's the horse.
- Why didn't you let him guess?
- I think I can take him off your hands for 50 dollars.
- Honey, you're making a big mistake. This is a very intelligent horse.
- We've been all through that, dear. We'll take the $50.
- There you are, ma'am... 50 dollars. And I think we both made a good deal.
[...]