A glowing red camera eye set in a curved white panel watches down a long white spaceship corridor where a tiny astronaut stands.

Original artwork, not a still

HAL 9000

I'm sorry, Dave. I'm afraid I can't do that.

— 2001: A Space Odyssey ‧ 1968

Behind the line

What it means

Our interpretation.

HAL does not shout or threaten; he apologises, which is far more chilling than rage. The phrase has become the all-purpose way to say a machine is refusing you, and it is the one 2001 line people quote without having seen the film. Writers of voice assistants, chatbots and sci-fi parody have all borrowed its soft, regretful refusal for decades.

Context reviewed

In context

Spoilers for 2001: A Space OdysseyShow the scene

In Stanley Kubrick's 1968 film, Dave Bowman, stuck outside the Discovery One in an EVA pod with the body of crewmate Frank Poole, begs HAL to open the pod bay doors. HAL, the ship's supposedly infallible computer, finally answers in the same unhurried voice he has used all film. He says he is sorry, then calmly adds that he cannot do it and explains why: he knows from lip-reading that Bowman and Poole planned to disconnect him. The part was voiced by Douglas Rain, who recorded HAL's lines in about a day and a half and who replaced Martin Balsam in post-production.

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