CueCat (1999-2001)
A device created for no existing demand. You could scan a barcode from a magazine and it would take you to the products webpage.
late 2000, advertisements containing CueCat barcodes briefly appeared in some high-circulation U.S. mass-market periodicals, notably Parade magazine, Forbes magazine and Wired magazine. For a time, RadioShack published catalogs containing these barcodes, and even distributed CueCat devices at no charge. CueCats were also bulk mailed (unsolicited) to certain mailing lists, such as subscribers of technology magazines, notably Wired magazine. For roughly a year, starting in October 2000, The Dallas Morning News and other Belo-owned newspapers added the barcodes next to major articles (Belo had invested in Digital Convergence).
edit: whew, that was a close one.