The "World’s Biggest Hacker," Gary McKinnon, dresses like David Bowie and allegedly hacked military installations because he believes the U.S. is hiding information about UFOs. At least according to this story. This is about the only time that I actually believe a hacker was justified (sorry, I’m kidding).

[For more about the U.S. government and its involvement with UFOs, read the fictional (yeah, right) "Little Green Men" by Christopher Buckley. Even better is his "Thank You For Smoking."]