When your favorite movies are black & white, and you confess that to people, many of them look at you as if you're some kind of alien species.
"Black and white?! That's boring!"
I grew up with a television that had a dial and wires to an outside antenna and showed only black & white. We didn't get a color TV until I was 12 years old. So for me, entertainment began in glorious black, white, and gray. That could account for my love of the oldies.
But a more likely reason is that classic movies are great! Color was available but not used for most movies. The studio heads didn't see the need for the extra expense -- especially when there were talents like Davis, Gable, Loy, Powell, Bogart, Grant, Arthur, Stewart, Cooper, Stanwyck, and Astaire and Rogers. People would go to the movies anyway. The Powers That Were, however, cared about quality. And that shows in the product they put out.
I've listed only five titles, but if you're new to classic black & white films, these are good ones to start with. Or if you've seen them before, it's always fun to watch them again, just to see what you might have missed the first time.
What classics would you recommend to the person just discovering the beauty of black & white movies?