The worst thing is that somewhere some kid will be congratulating himself on getting so many people to believe something completely ridiculous - fifteen years ago it took someone in need of an ego boost months to write code for a virus that stuck a silly message on other people's machines, these days it's a couple of dozen letters typed into an e-mail, and it sodding well works!
Don't get me started on the things people on Facebook can be made to believe...
I'm kinda tempted to mass mail/spam all my contacts with the Snopes site address, I've sent it in response to "Gangs are killing everyone in a green car because they feel like it, the police said so, honest! Send this to everyone you love otherwise you want them to die" enough times.
Edit: My mum's friend has actually sent her the actual "Microsoft is sending people money for forwarding an e-mail using technology that doesn't exist" mail - wondering if there is someone we need to notify for her own safety...