Because of your darn grapevine, that's why.
5 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 01:37:17 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, boy, was that a close shave!
- If we're not fired, what's going to happen when EMMARAC takes over?
- EMMARAC is not going to take over. It was never intended to take over.
- Because of your darn grapevine, that's why.
- They didn't want that Atlantic stock to go up while the merger was going.
- There's going to be more work here than ever before.
[...]