Cary Grant and Rosalind Russell in His Girl Friday (1940).
On the subject of the movie’s famous overlapping dialogue, Grant recalled, “When I first started in pictures, an actor didn’t have the freedom to interrupt the dialogue. But in His Girl Friday, Rosalind Russell and I were constantly interrupting each other. The sound men would say, ‘We can’t hear you.’ And we’d say, ‘Well, you’re not supposed to hear us. People do interrupt each other, you know.'”
Image scanned from Hollywood Picks the Classics by Afton Fraser (Bullfinch Press, 2004).
And, by the way, I’m getting many of my quotes from or about Cary from Nancy Nelson’s beguiling Evenings with Cary Grant (Citadel Press, 1991), which I highly recommend for all fans.