Sometime ago, Joe Blow registered his home business either online or with his local Yellow Pages, using his full address (say, "125 Main St. #4"). Eventually, it gets picked up by all the other online sites. Sometime later he decides that he doesn't want the "#4" part to show on the Internet.
So he starts an e-mail campaign to all of the hundreds, if not thousands, of Internet yellow page sites that list his address. Instead of a polite "Please update your database to remove the #4 in my address" message, he decides to go with the "Update my address or I will complain to your hosting company and sic my lawyer on you!" tone.
I replied with a short message that he has been removed from our directory and that he might get better responses from people by asking nicely instead of threatening legal action.