There's been so many of these over the years.
The basic premise being that it's hilarious to forward the email to 7/10/15 of your friends to see what happens.
Guess what? Nothing happens EXCEPT, all of your emails are harvested and sent to spammers as live email addresses.
The purpose of these chain emails is to bypass spam filters. They get sent out by your friends, therefore arrive in your inbox un-impeded.
Often they will contain hidden maliious code which harvests everybody's emails addresses and sends them to the spammers.
Do everybody a favour, and just delete these emails when they arrive, and reply to the sender with a polite comment about how bad they are.
Educate your friends!
Best of luck....