Cary Grant is professor David Huxley, a stolid paleontologist who plans to marry his wealthy assistant and then receive an endowment for his museum. Nothing will stand in her way of getting him. Of course, he's elated. Reluctantly, David agrees. He's content to live a passionless, overly cerebral, and predictable life.
Calamities Cut to the film's last scene.
But David surprises her by saying he has never had a better time in his whole life. David more than likes her. At the start of the film David was wrapped up in a lifeless existence. But after his many misadventures with Susan, he has been re-educated. For David now knows that Susan, despite her unpredictability and inspired lunacy, is much more important than grim Alice, the dinosaur project, or the museum.