45. Star Wars Episode III Revenge of the Sith
When Obi-Wan has defeated Anakin and is crying, yelling "You were my brother!" etc. everytime I see that scene, I realize that's pretty much how I felt about the prequel trilogy. There was so much promise (and that has even been proven more true by some of the quality storytelling in the Clone Wars Cartoon series and some prequel-era novels. But George didn't get almost any of that promise in the print.
This trilogy is sloppy and ham-fisted and boring for large stretches. And the finale entry is one of the worst offenders.
The only real upside? The Palpatine and Anakin scene at the opera where Palpatine tells the story of Darth Plaugeis and the Palpatine/Windu battle. Other than that, it's a lot nonsense.