"Jaws. When Brody sees the shark for the first time, noting laconically, "You're gonna need a bigger boat"
The scene I can't get out of my mind is at the beginning of the movie, when the girl is out swimming in the dark and the shark pulls her under the water and she bobs up with that startled look on her face and then she disappears under the water.
The scene in "Terms of Endearment" when Shirley MacLaine is screaming at the nurses in the hospital "My daughter needs drugs!" "Get her some drugs".
"Last of the Mohicans" The entire movie.
"On Golden Pond" when Hepburn tells Henry Fonda "You're my knight in shining armor"
"About Schmidt" at the end, when Jack Nicholson reads the letter and starts to cry.