Grinning and wild-eyed, Jack Nicholson smashes a door with an axe before poking his head through to shout at his terrified wife: 'Here's Johnny!' The chilling line, which the actor ad-libbed, from Stanley Kubrick's 1980 film The Shining yesterday topped a poll of scariest screen moments. It pushed The Exorcist (1973) into second place for the stomach-churning scene where Linda Blair's head spins round before she vomits.