Nothing else to say
In the 2000s, one of my favorite review sites to go to was that of “Mr. Cranky”. It was a satirical site (now no longer available), in which the reviews would state how bad the film really was (the highest rated were for films deemed “almost tolerable”).
Of the many reviews I had seen, my favorite header came from the review of Apollo 13, which read along the lines of “Spoiler: They survive.”
A older couple begins to quarrel. As the situation dies down, we see two young people look up from their books and notice each other. Had this happened in a movie these days, they would be texting, asking each other for their Snapchat profile. Since the film is long before the time of social media, the only thing these two strangers can really do is talk.
The whole opening dialogue on the train sets up what to expect from Before Sunrise: It is not about the content of the conversations, but the outer connection of the two leads.
Nothing else to say