I think I read somewhere that a group of psychiatrists watched like a 100 movies that had psychos in them and no country for old men was the most accurate. ( I would have thought that it would be Hannibal Lecter.)

The apartment, Casablanca, Gone with the wind, all quiet on the western front, Citizen Kane, Sunset Boulevard, Sergio Leones Dollars Trilogy and Once upon a time in the west.
The Godfather trilogy ( the 3rd one could have been a lot better), Apocalypse Now.

These are some good ones.

Edit: This is a good place to find old and new movies which are actually good

W Taste

Also Fargo has to be my favourite Coen Brothers movie.

W Taste

Also Fargo has to be my favourite Coen Brothers movie.

Thanks dude

Do the right thing, 12 angry men, there will be blood, Psycho, Vertigo, Rear window, Marriage Story, Misery.
All David fincher movies except for alien 3 and curious case of Benjamin button

There are tons more but these are the movies that came to mind

Edit: here’s a list of good war films.
https://boxd.it/1LFdY