BARCODES! No one cares about 'em. Yet they were once exciting, cutting edge tech. Heck, old computer magazines often had entire sections dedicated to UPC scanning and software. So I finally got a PC barcode reader kit from 1994 and used it with some POS applications! And Duke 3D.
I also have a CueCat! I ordered it back in the 90s when it was still being advertised!