In terms of pure pop culture Q score, no malicious computer is more famous than HAL 9000, the disturbingly calm antagonist of Stanley Kubrick's classic "2001: A Space Odyssey." In the film, based on Arthur C. Clarke's story, HAL is the ship computer that controls the Discovery One spacecraft en route to Jupiter. HAL famously flips out and attempts to kill the mission astronauts. Pilot Dave Bowman survives and unplugs HAL, one electronic synapse at a time, in the film's most chilling scene. Interestingly, Kubrick frames HAL's decision as an ethical quandary for the machine -- the AI is conflicted about its mission directives, and decides killing the crew is actually the right thing to do.