A system administrator
who has studied the Dark Side of the Force
and uses it to his or her own ends.
This is includes the terrifying of users until they stop hounding the admin with ridiculous support calls, limiting all email to a maximum of 256 kilobytes, uninstalling all versions of Microsoft Outlook and Outlook Express and keeping a close eye on exactly how much porn the boss is downloading for future blackmail purposes.
"Always two there are, a Master and an Apprentice."