Casablanca

"Here's looking at you, kid."

Prior to his time in Casablanca, Rick met Ilsa in Paris, where they developed a close relationship. In his apartment, Rick opens a bottle of champagne and toasts Ilsa with this famous line.

Note that, Rick voices that line to Ilsa once again as she prepares to depart Casablanca on an airplane. Where he also delivers another famous line to Ilsa.