I’m guessing many, if not most, of you have heard about this by now, but in case you haven’t and your mind is in need of being boggled:

http://venturebeat.com/2011/12/27/ocean-marketing-how-to-self-destruct-your-company-with-just-a-few-measly-emails/

If this were fiction, no one would believe it.  You can’t write this stuff.  Ya just can’t.