News: What are the real risks of cyberterrorism?
In 1998, a 12-year-old hacker broke into the computer system that controlled the floodgates of the Theodore Roosevelt Dam in Arizona, according to a June Washington Post report. If the gates had been opened, the article added, walls of water could have flooded the cities of Tempe and Mesa, whose populations total nearly 1 million.

There was just one problem with the account: It wasn't true.
http://zdnet.com.com/2100-1105-955293.html