When Harry Met Sally... (1989)

Proof that a romance can cover years without a war in sight. Harry and Sally meet on a drive to New York after college, dislike each other, and keep running into each other as their lives change, until a friendship forms that neither of them planned. Rob Reiner and writer Nora Ephron let the gaps between meetings do the work: each time they reconnect, they are older and a little less sure of themselves. Billy Crystal and Meg Ryan have rhythm that makes even arguments feel like flirting, and the delicatessen scene is famous for good reason. Pick this when you want the long-haul romance in its lightest form, funny from start to finish and still moving at its New Year's Eve ending.