Here are five more pretty-good (I think) movies that are currently free to watch on YouTube. As with all of these, they may suddenly not be free or may not be free without ads but right now, they're free. Someone has classified them as adult in some undefined way so YouTube will not allow me to embed them but if you click on the hyperlinked name of any of these movies, you should be able to watch it — at the moment, free and without ads…
I always really liked Billy Wilder's 1960 movie with Jack Lemmon and Shirley MacLaine, The Apartment.
And I always liked another film made the same year, Inherit the Wind, starring Spencer Tracy and Fredric March. Hard to believe this film was directed by the same man who, just three years later, directed Tracy in It's a Mad, Mad, Mad, Mad World.
And also from 1960: The Magnificent Seven. If you know, you know.
And moving up more than a few years, here's the Director's Cut of Mr. Spielberg's Close Encounters of the Third Kind. Warning: Don't watch this if you're seated next to Abe Vigoda. Here's why and yes, I know Abe Vigoda has passed-away but with him, it was hard to tell.
And I can't embed it but if you're in a Christmasy mood, you might enjoy one of the most-imitated movies ever made, Die Hard.