[Pirate]

Just off the top of my head.

King Kong:
The scene on the Empire State Building when they watch the sunset. Not a direct declaration, but I feel it’s the most potent and sobering scene where the love is declared visually.

Roman Holiday:
When Hepburn looks at Peck in the crowd. Again, a visual declaration.

The Empire Strikes Back:
Leia: I love you.
Han: I know.

Brokeback Mountain:
When Ennis holds Jack’s shirt up against him.

Jerry Maguire:
You know the scene. So sue me.

Say Anything:
The boombox scene.

Moulin Rouge:
“Come What May”