Before Sunset
Partial spoilers. I'd recommend watching the first two films before reading this.
The tone of this film was different to the first in the trilogy. The first one was all about passion, energy, making a real connection, whatever, but this one was more melancholic. Their conversation was so unbelievably honest and I can see myself relating to what they thought about their lives in general. At the end of the day, it's just a romantic conversation reminiscing over what could've been, but it always had my attention. I learned more about the mistakes people make in life than I did about their romance. Not quite as good as I was hoping overall but still brilliant in many ways.