Microsoft G5s?
Michael Hanscom did not pose nude on Flickr, attack the locals with a stick on his trip to Mexico, or dress up like the Fairy Princess while calling in sick. His crime? In October 2003, the Microsoft temp posted photos of Macintosh G5s being unloaded on the Redmond campus to his blog with the title "Even Microsoft wants G5s." And that was enough to get him canned from his job in Microsoft’s print shop for an alleged "security violation." Apparently, the world’s largest developer of software for the Mac (besides Apple) didn’t want anyone to know that some of its employees use Macs.
(Thanks for Michael Hanscom for use of the photo.)