Oh, a good selection of the classics, for sure; e.g.:
Frankenstein, with Boris Karloff (1931)
Dracula, with Bela Lugosi and that marvelous guy who played Renfield—I don’t think I ever saw him in anything else (1941)
The Wolfman, with Lon Chaney (1941)
I love the good old-fashioned black-and-white creepers with their horror and tragedy, their primitive special effects, and their doomed heroes—ridiculous endings and all. I have a whole collection of them on DVD. I used to let my kids stay up as late as they wanted one night in the summer, and we would make popcorn and watch these very tame, innocent scary movies, which I always vetted first.
If those aren’t long enough to keep me watching for a day, I’d add these:
Invasion of the Body Snatchers (1956)
and
I Walked with a Zombie (1943)
For real shivers, though, give me stories like the ones in Bennett Cerf’s Famous Ghost Stories (1944). When the story takes place within the privacy of your mind rather than “out there” on a screen, the scares seem to deliver a greater thrill of horror.