Because I don't want to ruin anything for anyone who hasn't seen these movies, I'll just give you a brief scene description that should make it obvious which moments I'm talking about.
Here are ten of my favorite movie moments:

Obscure, yes, but a good movie. It's one of those Steve Martin dramas (I think The Spanish Prisoner is the only other one). Martin masquerades as a faith healer, scamming people across the country. Then he sees the error of his ways. Yes, it's a common story, but the way the ending plays out: fantastic! "Yessir. Yessir."
9. Field of Dreams
I know this one's obvious, that's why it's at number nine. But really, Kevin Costner finally finds out what it was all for, and he gets to have a catch.
8. Crash
I didn't love this movie as a whole but it had some great scenes. The most powerful: (1) Matt Dillon saves the woman from the car, and (2) The scenes with the invisible cloak.

The tuxedo, the rose, and the escalator.
6. Life Is Beautiful
The radio scene and the march, while the boy looks on from the letter box.
5. The Kid
The discussion between Bruce Willis and Jean Smart in the bar. (And this scene almost ended up on the cutting-room floor.)

The groom's gift. The look on John Cusack's face says it all. Brilliance.
3. Unstrung Heroes
Andie MacDowell goes to fix the skipping record while the family makes pancakes. Brilliant direction by Diane Keaton and wonderful acting from everyone involved (especially John Turturro).
2. I Am Legend
Will Smith sings Bob Marley's "Three Little Birds" to his dog. Then the director takes the perfect close-up of Smith's face -- immaculate acting.
1. Children of Men
Clive Owen guides the baby through the warzone. If this doesn't make you feel something then you have no heart.
