another random user (2645241) writes "Sunday the 7 October is the 60th anniversary of the barcode patent, filed in the US in 1952. However the distinctive black-and-white stripes did not make their first appearance in an American shop until 1974 — because the laser technology used to read them did not exist." Link to Original Source
Real Users find the one combination of bizarre input values that shuts
down the system for days.