The 'Ring' Prank

Here is a prank for you to use on your friends.

You send them an emailed link.
They click the link and watch the video from the movie 'The Ring'.
As soon as they finish the video, their phone rings, with the caller ID showing 000-000-0000, and a voice says, "You will die in 7 days", or any other message you specify.

And it's free.

Uh oh! What have I done?