On July 19, 1987, as the Earth crosses the tail of a comet, previously inanimate machines suddenly spring to life; an ATM insults a customer and a bascule bridge rises during heavy traffic, causing all vehicles upon the bridge to fall into the river or collide. Chaos sets in as machines of all kinds begin attacking humans worldwide. At the Dixie Boy Truck Stop just outside Wilmington, North Carolina, employee Duncan Keller is blinded after a gas pump sprays diesel in his eyes. An electric knife injures waitress Wanda June, and arcade machines in the back room electrocute a customer. Cook and paroled ex-convict Bill Robinson begins to suspect something is wrong. Meanwhile, at a Little League game, a vending machine kills the coach by firing canned soda point-blank at him. A driverless road roller flattens one of the fleeing children, but Duncan's son Deke manages to escape on his bike. .

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