Well, they had to leave in a hurry, and they said you can keep him, you can sell him, do anything you want with him.
6 seconds sound clip from the Mister Ed movie soundboard.
You can hear this line at 00:04:49 in the DVD version of the movie.
Quote context
[...]
- Him? He doesn't bite. He's just a mangy old nag.
- As a matter of fact, that's what I came to tell you about.
- You see, the people who rented this house before you bought it owned this horse.
- Oh!
- Of course not. We'll sell him.
- I'm glad to hear you two arguing. For a moment, I was wondering if you were a normal married couple.
[...]