I still think Citizen Kane is brilliant, even if it's become fashionable to bash it for being overhyped. What really stuck with me was its theme about the power of memory. How the past shapes who you are in the present. This speech by Kane's business colleague Mr. Burnstein really sticks out at me:
The Third Man and Double Indemnity are classic noir. The Third Man has the best black and white photography you'll ever see in a movie and a film-stealing turn by Orson Welles, whose character is so charismatic that he almost makes you root for him. Until you remember he murdered people and sold bad medicine that turned a bunch of kids into vegetables. The scene ends with a great sewer chase and a realistic downer ending that the filmmakers fought to stay firm on.
Double Indemnity pushed the Hayes Code as far as it could go, doing everything it could to make you like the main villain (even casting the fatherly Fred MacMurray to play him.) Fred's an insurance fraud investigator who wants to use the knowledge he's gained from his job to pull off the perfect insurance fraud. Of course, since it's a LIFE insurance fraud, that means Fred has to kill someone to collect the money. He doesn't win (you know this by the opening scene so it's not a spoiler,) and the movie does its best to give us a "criminals never prosper" message, but it rings hollow since Fred's been our viewpoint character for the whole movie and has had several "pet the dog" moments. The viewer also really wants to see if he can pull his scheme off and hook up with the hot (fake) blonde (Barbara Stanwyck,) who's married to the soon to be murdered man. There are a lot of movies set in LA that make it seem like the most sordid place on Earth (Mulholland Drive, Sunset Boulevard,) but Double Indemnity really pushes this idea to the limit. LA just seemed ridiculously unwholesome in this movie, long before it was overrun by pedos and junkies.