Stuxnet: 21st-century cyber weapon of mass destruction

Out of all over-the-top movies, Stuxnet actually makes the Die Hard 4.0 scenario less unrealistic:

McClane takes Farrell to the FBI headquarters in Washington, D.C., where Farrell is questioned. FBI director Miguel Bowman (Cliff Curtis) is uninterested in his surmise: Farrell believes that the terrorists are mounting a "fire sale" (where "everything must go") attack, taking advantage of the vulnerability of the nation's computer-controlled infrastructure.

A more detailed description of Stuxnet @ wikipedia. Scary shit.