Good night.

3 seconds sound clip from the Mister Ed movie soundboard.

You can hear this line at 00:20:08 in the DVD version of the episode.

Quote context

[...]

- Uh, can I get you some oats or anything, old horse?

- Nope. I'm fine.

- Uh, can I open the window for you, Mister Ed?

- Nope. Leave it closed.

- Well, good night, horse.

- Good night.

- Hey, Wilbur.

- What?

- Nice gadget you got there.

- Oh, yeah. Yes, it is.

[...]