- And you know something else?
- Don't tell! You crossed your heart you wouldn't tell.
- I crossed it with my left hand.

— Tootie Smith (Brien), Agnes Smith (Joan Carroll), (Margaret O’Brien)

6 seconds sound clip from the Meet Me in St. Louis (1944) movie soundboard.

You can hear this line at 00:50:04.939 in the DVD version of the movie.

Quote context

[...]

- He buys meat, and then he buys poison, and then he puts them all together.

- And then he burns the cats at midnight in his furnace. You can smell the smoke.

- That's horrible. Are you sure?

- Johnny Tevis smelled smoke and peeked in the window and there was a box of dead cats.

- And Mr. Braukoff was beating his wife with a red-hot poker.

- I never would have believed it. He looks like such a quiet man.

- And you know something else?

- Don't tell! You crossed your heart you wouldn't tell.

- I crossed it with my left hand.

- Mr. Braukoff has empty whiskey bottles in his cellar.

- Boo!

- Mrs. Smith, who are these boys?

- It's me, Katie. It's Agnes.

- The saints preserve us, it is! You had me fooled.

- Mama, we fooled her!

- Well, if you can fool Katie, you can fool anyone.

[...]