Plot: A control-freak television producer (Katherine Heigl) meets a boorish, sexist TV commentator (Gerard Butler). They hate each other—until they don't.

First-take message: Opposites attract.

On second thought... Nothing hidden here: Opposites attract.

We wonder: Do two very different people change when they fall in love?

Sills says: "Strong traits do not disappear, but great couples move in a little more toward the middle; they soften each other's edges and accept each other's inherent differences. Troubled couples tend to move to further extremes."

3 movies about psychology