Where do email forwards come from?

email forwards usually come from people with little or no social life, sitting at a computer for extended periods of time, just finding funny, touching, shocking, or patriotic pictures, sayings, or videos. They are then compiled into an email and sent to every person on their mailing list or in their E-mail contact list. The people from the contact list then, in turn, send it to everyone in their contact list. And it just builds exponentially until it reaches your own inbox.