Wayne Hariston tells this story (Reader’s Digest)

My wife and I get along just great—except she’s a back-seat driver second to none. On my way home from work one day, my cell phone rang as I merged onto a freeway bypass. It was my wife. By chance, she had entered the bypass right behind me.

"Honey," she said, "your turn signal is still on. And put your lights on—it’s starting to rain."