Viral Marketing Campaign

Hi everyone.  If you were going to start a viral marketing campaign, what would your tactics be?  Would you go for a funny approach?  Or perhaps a mysterious theme to intice the view to find out more?  Maybe you'd make a video with a lot of puppies and kittens to soften the viewers hearts?  How can I make money online?I'd love to hear your ideas and what you would do with them.  Post your comments below.