If you already know this, I am sorry for the repetition, but I have to say it. I get too many of these darn things.
When you get an email that asks you to forward it on to 5-10 or more people, there is a 99% chance that the reason for that request is not good. Most of the time, it is an email that has been sent by a would-be spammer, who has found the perfect way to get additional email addresses.
They are very good at making up emails that tug at your heartstrings, or call on your patriotism, support for our soldiers and/or deep friendships - so that you will want to send them on to your friends and family. You are not doing your friends and family any favors when you forward those emails, since every address to which you send it is then sent back to the spammer - and voila - he has more and more places to send his junk, in the hopes that you will click on it and buy. Or, they might be attaching tracking cookies to your computer, so that they know the types of sites you visit and thus they know how to target specific ads.
Please think twice, before you forward these types of emails! If you get one that asks (or demands) that you forward it, "keep it going around the world" or "don't be the one to let it stop", send it as safely as possible. Wipe all the addresses off the email you get and send them as BCC - so you don't pass the addresses back to the spammer. (At least, I hope they can't get them that way!) Don't let them scare you either; nothing bad will happen if you simply delete that email.