I went to see the movie 9 to 5 by myself when it came out in late 1980. Although I knew no one in the theater, it was like being with a giant group of friends, all hooting and cheering each time the stars stood up to the boss, that “sexist, egotistical, lying, hypocritical bigot.” I knew Jane Fonda and Lily Tomlin would be fabulous. But I had no idea that Dolly Parton, starring in a movie for the very first time, would show up as such a fierce and hilarious co-conspirator. First there was...