Love Story (1970)
Stars: Ryan O'Neal, Ali MacGraw
If you didn't know that this movie would be a heart-wrencher from the title, the first lines will tip you off: "What can you say about a 25-year-old girl who died? That she was beautiful and brilliant? That she loved Mozart and Bach? The Beatles? And me?" Hoo boy, here comes the sad.
Aristocratic Oliver (O'Neal) falls for and marries working-class Jennifer (MacGraw), alienating his family in the process. As they're scrimping and saving while Oliver works his way through Harvard Law, Jennifer gets sick and eventually dies. Which brings us to the other famous line from this film: "Love means never having to say you're sorry." Scientists are still trying to figure out exactly what this means, but whatever—it works.