Shut up, Bert. Sourpuss is right.

4 seconds sound clip from the Meet John Doe (1941) movie soundboard.

You can hear this line at 01:52:26 in the DVD version of the movie.

Quote context

[...]

- Listen, Ann. He can't possibly get in without our seeing him.

- I'm watching the side door. Colonel's out front, so stop worrying.

- Thank you.

- Why Ann!

- Ann, don't be foolish.

- If this isn't the craziest, the battiest, the looniest wild goose chase I ever heard of.

- Shut up, Bert. Sourpuss is right.

- If he is, I'm a banana split.

- That man's gonna be on that roof.

- Don't ask me how I know. I just know. And you know it as well as you do.

- Sure, sure... I'd like to believe in fairy tales, but a guy that's a fake isn't gonna jump off any roof.

[...]