I once made the mistake of ordering something from Soccer.com. They sold out my mailing info, apparently, to EastBay.
Since then I get inundated with EastBay catalogs -- which are filled with gear and equipment for sports I don't give a rat's ass about. And I've called three times to make them stop sending them, and they still keep coming. Apparently their spam-and-dead-trees cannon has no off switch.