And I'm warning you now, if you swear on this... it is me old woman herself who'd be looking down on you from heaven above... and praying the saints to put a great curse on you if she hears you swear a lie.
12 seconds sound clip from the Anna Christie (1930) movie soundboard.
You can hear this line at 01:25:44 in the DVD version of the movie.
Quote context
[...]
- Oh, sure, Anna, if I could only be believing you, now.
- Why, you've got to believe it. What can I do? What will do to prove to you I'm not lying?
- Anna, would you...? Would you be willing to swear an oath, a terrible, fearful oath?
- Oh, sure, I will, Matt, on anything.
- Give it to me. What do you want me to swear? You say it.
- Swear I'm the only man in the world ever you felt love for.
- I swear it. I swear it by God.
- And may the blackest curse of God strike you if you're lying.
[...]