Bogey

In a mental hospital two men, both around fifty, start talking. One of them is convinced that he is Humphrey Bogart, while the other believes himself to be Cary Grant (although his friend thinks that he is Clark Gable). But, as their hilarious, antagonistic conversation continues, we find out that they are not as mad as they seem, and that they haven't really forgotten what has led them to adopt their fictional personalities.