Here is an email I received today. I left all spelling and grammar as is:

Klez.E is the most common world-wide spreading worm.It's very dangerous by corrupting your files.
Because of its very smart stealth and anti-anti-virus technic,most common AV software can't detect or clean it.
We developed this free immunity tool to defeat the malicious virus.
You only need to run this tool once,and then Klez will never come into your PC.
NOTE: Because this tool acts as a fake Klez to fool the real worm,some AV monitor maybe cry when you run it.
If so,Ignore the warning,and select 'continue'.
If you have any question,please mail to me.

Strangely enough the immunity tool was not attached as promised, which disappointed me. I am very nervous about contracting this stealth anti-anti-virus worm, so if anyone else has access to it please email it to me. I was very lucky to be randomly selected as a recipient of this fantastic computer protection aid, now if only I could actually get it...