Similar to the "You've Won!" spam or the "Your order is ready" or the "You're e-mail has been returned" ones, posing as a Sys-Op message.

More and more vile versions of the old bait-and-switch scam coming out all the time.

I also hate those pop-up ads that are made to resemble a regular alert from the Windows OS. The unwary click on them and end up installing some unwanted spyware application on their computer. Must be special region of Hell reserved for the pricks designing those.