I was listening to
This American Life last night.. a repeat from 1/11/2002 in which Act Four is about a message a mother left for her son on his Columbia University college voicemail. He forwarded the message to a few friends for a good chuckle and they, in turn, also forwarded the message. It multiplied. It's a funny story, and worth a listen..
From WBEZ in Chicago, This American Life, Real Audio link
here. Note that the Real Audio link is the entire show so you'll have to listen all the way through. Sorry.