Polariod commercial (1979) featuring James Garner and Marriette Hartley
In the late 70's, Polaroid featured a series of commercials featuring James Garner and Marriette Hartley. These commercials led most people to think the two were married to each other due to their great on-screen chemistry. In real life, the two were not married to each other but simply shared the spotlight on the memorable commercials.
Here's one from Christmas of 1979.