Best one I've heard of is the Honor Virus. You get an e-mail that tells you you've gotten a virus on the honor system and that you must forward this e-mail to all of your friends and then delete your own hard drive.
I have no idea if someone's actually followed through, but chances are someone has.
 
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				 Not to mention you posted a link to a video about people signing a petition to ban water recently.
			
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 Ah yes, the Dihydrogen Oxide scare. 
