Pat and Mike is a 1952 American romantic comedy film starring Spencer Tracy and Katharine Hepburn. The movie was written by Ruth Gordon and Garson Kanin, and directed by George Cukor, who also directed The Philadelphia Story (1940) with Hepburn, and Adam's Rib (1949) with Hepburn and Tracy. Wikipedia
(Last lines) Pat Pemberton: What would happen if I ever dropped you? Mike Conovan: I'd go right down the drain. Pat Pemberton: And? Mike Conovan: I'd take you right down with me shorty.