Actor: Lauren Bacall

Lauren Bacall was nineteen in To Have and Have Not and delivered the whistling line to Humphrey Bogart, whom she married the following year. The famous downward tilt of the head was a device to stop herself shaking with nerves.

Howard Hawks had her shout in a canyon for weeks to lower her voice permanently. The Big Sleep, Key Largo and Dark Passage followed, and she received an honorary Academy Award in 2009 after a single competitive nomination.