What makes this movie great is the performances of Cary Grant and Rosalind Russell. They are both great actors and both have been in great movies, but they have never been better. First changing Russell's character from a man to woman is brilliant. But most importantly the fast paced scene's between Grant and Russell, many of those ad-lib by the two actors doing some of their best work ever. It is rare that you see two acting legends at the top of their games.