I knew it! I just knew it!
5 seconds sound clip from the Mister Ed movie soundboard.
You can hear this line at 00:19:05 in the DVD version of the movie.
Quote context
[...]
- I'm sorry, but the party for tonight is canceled. Goodbye.
- The party's been called off.
- Don't call me Carol! My name is Mrs. Jones!
- Got to prove that this horse t...
- A tape recorder. That'll do it!
[...]