Read this article on the Stuxnet Computer Worm that shut down Iran's nuclear facilities. Interesting if you are into writing this type of scripts. James Bond has nothing on this worm.
http://www.foxnews.com/scitech/2010/11/26/secret-agent-crippled-irans-nuclear-ambitions/
http://www.foxnews.com/scitech/2010/11/26/secret-agent-crippled-irans-nuclear-ambitions/