I don't think that rapid-fire dialogue alone makes a movie, but this seems to be one of the best examples, and I enjoyed Cary Grant and Rosalind Russell a great deal. Man, I know this isn't news or anything, but Cary Grant was really fucking charming. Funny how Rosalind Russell's character in this 1940s film is a stronger leading lady character than most of those in modern rom-coms.
This would make a great double-feature with Network. I would watch them both and then sit and cry about the modern 24-hour news cycle.
Also, quite possibly the worst movie poster ever.