I'm not really into old movies. I've never seen Citizen Kane (supposedly the best movie ever, but for some reason, I doubt that). Never seen Singing in the Rain, either.
I've seen "Mr. Smith Goes to Washington"...that was pretty

I've also seen a few Hitchcock movies..."North by Northwest" "Vertigo" "Rear Window" (if that's the right title.
I saw those in my 20th Century Film class in High School.
Which reminds me...I add American Graffiti to my list of good movies.