Evil Evil prank call

http://monkeydoo.com/onlineflash_thering2.php

Check this out.
When you click on the website, you type in your friend's phone number, fill in a brief word or two about them (i.e. location, birthdate, age or whatever), tell the system what you want it to say, and then a link will be created for your friend.
Once they click on it, a ring-esque video will play and their phone will be called right away and the message will be delivered.
Freaky. I tried it on myself.

Simply genious (if you're into that sort of prank call).