Dang, SolGrundy, I was thinking of the Annie Hall lobster scene, too! But I also love the scene where they’re sitting on a park bench and people-watching, just because they’re so perfectly relaxed and happy together.
The fancy-dress ball in The Sound of Music, when Baron Von Trapp cuts in on his son in order to dance with Maria.
In the original The Scarlet Pimpernel, when Leslie Howard is gently interrogating his unknowing wife (Merle Oberon) and leans in very closely, gazing in her eyes very intently, and almost too late regains his cool composure, resuming his “dandy” act. (Their chemistry was very real; IRL those two actors became involved in a passionate extramarital affair.)
The “leaning” scene from While You Were Sleeping. That, and when Sandra Bullock and Bill Pullman are slipping on ice. A great, uh, “icebreaker,” there.
Superman and Lois Lane getting to know each other on her splendid rooftop deck… although I’m not sure if I envy her character more for Christopher Reeve or for her improbably impressive Manhattan apartment! (Superman, definitely.)
The teary reunion between Juliet Stevenson and Alan Rickman in **Truly, Madly, Deeply[/] when he first comes back from the dead. (Bonus romance points: later on, you get a bit of David Lean’s Brief Encounter tossed in for free!)
The long, interrupted kissing scene between Ingrid Bergman and Cary Grant in Notorious. In order to comply with decency codes, Hitchcock interrupted their kiss with dialogue and movement, and it comes off even more convincingly for it.
When Princess Leia calls Han Solo a “rascal” in SW: TESB and he seizes on it, teases her, and starts to lean in… 