Words can’t hurt, but they can be terrifying. This is put to very good use in the opening scenes of *When a Stranger Calls*, the 1979 horror film directed by Fred Walton. The protagonist, played by Carol Kane, is Jill Johnson, a young woman babysitting two children in the home of Mr and Mrs Mandrakis. During the night, she begins receiving telephone calls after which the caller either hangs up or asks, “Have you che…