This is interesting, having your own computer held hostage, remotely.
A recent malicious campaign spotted by GFI researchers uses a variation of spoofed reported attack pages, which spurs users to install an "update" for Internet Explorer. The offered update is fake and the downloaded code actually locks the user out of his/her PC and plasters a warning across the the screen telling him/her that 19 "unlicensed software, movies and music" files have been found on the computer, along with "materials with pornographic content (including homosexual content pornography)." While threatening to send the "evidence" to the police, the scammers offer the user a way out by calling a phone number and paying a ransom fee.
http://www.net-security.org/malware_news.php?id=1667