JURASSIC PARK - "Welcome to Jurassic Park..." and then Grant sees all the Brachiosaurs in the lagoon. Those visuals plus Williams' beautiful theme still gets me overwhelmed...even two weeks ago during the 3D IMAX trailer.
SAVING PRIVATE RYAN - "Tell me I'm a good man..."
ROBOCOP - Robocop returning to the Murphy family's empty home and having flashbacks of his former life
GREEN MILE - The epilogue in which the older Paul is talking about his "punishment for letting John Coffey ride the lightning" and seeing him leave the old woman's funeral, finding Mr. Jingles, and wondering how long he has left until death.
UP - Naturally, the opening montage.
FORREST GUMP - Forrest talking to Jenny right before she died and then the following scene at her grave.
STAR WARS EPISODE III: REVENGE OF THE SITH - The closing montage the first time I saw it.
JACOB'S LADDER - The ending where his son whispers "Dad, let's go up" and you realize he's finally going to be at peace with his son.
And not movie-related, but several moments in BABYLON 5. Specifically:
1. Kosh's goodbye to Sheridan as the Shadows tear him apart (Season 3 - 'Interludes and Examinations')
2. Sheridan's attack on Z'Ha'Dum (Season 3 - 'Z'Ha'Dum')
3. The dinner toast, Sheridan's goodbye to Delenn, the destruction of Babylon 5, and the final montage (Season 5 - 'Sleeping in Light')