The best way in the world to advertise is to get somebody else to run around with the name of your product on their person or showing it around somewhere and not only that but they're paying for it.
“I bought some books in order to learn the first principles of philosophy.”
“I still have people saying to me, 'Oh, you're still together?' They don't realize Leppard's been around this whole time, because people just don't get to hear us.”