Bill and his wife, Sherry, get along just great, except that Bill complains Sherry is a "backseat driver" second to none.
After years of putting up with her pestering, Bill finally decided he'd had enough and advised Sherry that he would no longer drive with her in the car.
Later that day, on his way home from work, Bill's cell phone rang as he was merging onto a freeway. It was Sherry calling.
By chance, she had entered the freeway right behind him. "Honey," she said sweetly, "your turn signal is still on. And turn on your lights; it's starting to rain."