The original theatrical ending of Return of the Jedi. This troper never fails to tear up when Leia runs up and hugs Luke. For some reason this moment was shortened in the 1997 release onwards. and also, Luke seeing his father as the man he would have been had he not turned to the dark side, sharing a friendly look with Obi-Wan and then favoring his offspring with a loving smile.
The ending also has the entire galaxy celebrating when the second Death Star is destroyed, which means that the Imperial army is gone and freedom and democracy have returned. It's just... the fireworks, the cheering, the energy... *sniff*
For me, it's the hug between Luke and Wedge, especially when you consider how Wedge and Rogue Squadron fought nonstop while Luke trained in the Force. Their relationship may have been mainly professional, but their embrace is warm and brotherly, each sharing their relief and thanking the other for their tenacity.
The hug between Leia, Luke, and Han at the end of A New Hope after the destruction of the Death Star is another great moment. Their exhilaration is just beautiful.
Also, Han coming back at the last minute to cover Luke so Luke can destroy the Death Star is a great Big Damn Heroes moment. "Great shot, kid, that was one in a million!"
It's blink-and-you-miss-it, but in the first movie, Vader says, "Only your hatred can destroy me." Think about it - there's a double meaning: it would kinda suck if your own son hated you, wouldn't it?
This troper has always loved Luke's Shut Up, Hannibal! to The Emperor, but one line always stands out because of its multitude of heartwarming implications;
Luke: I am a Jedi, like my father before me.
Darth Vaders' son, who has every reason to deny even the remotest connection with him, has just openly, and proudly acknowledged the relationship between them. Considering he's been trying to get his son on his side for two movies now, that's gotta mean something.
That the man he was, someone who has made so many terrible mistakes, is a person his son has decided is worthy of his respect and admiration. In fact, the implication of that statement is that he still considers his father a Jedi, and is therefore capable of redemption.
His son has utterly surpassed him; he's mastered himself and the ways of the Jedi, has gained power greater than his own without falling to the dark side, and has shown up alone to face the most powerful evil in the galaxy and has basically just won by refusing to give the Emperor what he wants- how proud would that make anyone feel, to see their son be so epically awesome?
For this troper, this one line is what lays the foundation for his redemption.
Also involving Obi-Wan and Anakin, Obi-Wan's interior monologue in the novelization of Revenge of the Sith where, after mutilating Anakin he realizes that he can honor the memory of the man his friend used to be by protecting Anakin's kids.
“Anakin survived it,” Obi-Wan said. “Luke can, too. And I can — well, I could take him there, and watch over him. Protect him from the worst of the planet’s dangers, until he can learn to protect himself.”
“Like a father you wish to be, young Obi-Wan?”
“More an . . . eccentric old uncle, I think. It is a part I can play very well. To keep watch over Anakin’s son—“ Obi-Wan sighed, finally allowing his face to register a suggestion of his old, gentle smile. “I can’t imagine a better way to spend the rest of my life.”
The dark is generous, and it is patient, and it always wins - but in the heart of its strength lies weakness: one lone candle is enough to hold it back.