-The very first scene when Bonasera is explaining his situation to the Godfather.

-The scenes where Michael falls in love with the girl in Sicily, only to have his heart broken

-"Never take sides with anyone against the family again...ever"

-The baptism sequence (I think it would have to be my favorite, not sure though)

-Michael being donned as Kay watches from the next room

-The scenes where Geary's running his mouth to the Corleone's, the brothel scene, and then the change in his tone

-Paolo's death, and Vito's mother trying to bargain with Don Ciccio

-Vito's revenge on Ciccio

-The scenes where Vito starts helping others, like Signora Colombo

-The scene where Kay tells Mike she got an abortion

-The scene where Mike closes the door in her face after she says goodbye to Anthony and Mary

-The scene where Michael tells his family he enlisted in the marines

-The scene with Joey Zasa, Vincent, and Michael in his office

-"I say we take Zasa out"

-The scenes which Michael tells his son, Anthony, about his law school plans, and then his argument with Kay about it

-"I love you cuz", it's so pathetic that it's a classic

-The recollection scene

-The scene where Michael confesses his sins to the cardinal

-The meeting of the families, and the helicopter intervention

-When Joe Zasa got shot, "hey Joey, up your ass!"

-The silent cry of Michael Corleone

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I know, that's a lot, but those are my favorites.