RFID Targeted Advertising

After reading mention of a patent Kodak filed regarding edible RFID tags for medical purposes and light snacks, and another story about Hitachi's RFID powder, it occurred to me that someone will create a system for targeted toilet advertising based on what you've recently eaten. Trust me - someone will do it! (Heck, I thought about not posting this at all and instead filing my own patent...but I think I'll save that for a more "meaningful" invention.)