I know it is hard to list just one.
But I have faith you can do it if you think it over.
I have several that would be in my top 10, but lately the one that is my favorite comes from a classic 1930’s movie….
I Never Drink....Wine
I could not find the youtube version of it in English. so I had to go to TCM to capture the whole scene.
So…. how about your favorite line from a movie that most people would label a “classic” film?