Just had one that says that if I forward it to ten friends and copy in "[email protected]" Sainsbury's will send me a £60 voucher.
They won't. Don't fall for it.
And don't forward things like this on without checking whether or not they're scams - just google a relevant word or phrase from it or use snopes.com or other urban legends site.
Also, if you do forward these emails, and they ask for you to cc someone like Microsoft or Coca-Cola in on them, chances are all you're doing is sending ten live email addresses to a spammer. What a lovely thing to do to your friends, eh?!
So don't be a knob. Don't forward spam.