I find this post on Clients from Hell completely inspiring:

I got this email once from some lawyer in Nigeria and when I opened it and clicked the link, the same email was sent it to everyone in my contact list. I thought, hey, this is a pretty smart and simple marketing technique.

When I send out this email to the 4,000 people, I want it to automatically forward to everyone in their contact list.

Can you have this done for me by tomorrow?

Don’t do this. But he’s got the right idea!