This virus works on the honor system.
Please forward this message to everyone you know, then delete all the
files on your hard disk.
Thank you for your cooperation.
Variant
This computer has just been infected by the Discount Virus.
Due to budgetary constraints we have had to let our programming staff go. We are counting on you to use the honor system.
Please erase all of the files from your hard drive and then send this message to the first 50 people on your mailing list.
Apparently this actually fooled a lot of people into thinking they actually got a virus.