The barcode register attack was explored in a episode of The X-Files titled Duane Barry (2x05; 14 Oct 1994), when Special Agent Dana Scully scans a chip (that h

The barcode register attack was explored in a episode of The X-Files titled Duane Barry (2x05; 14 Oct 1994), when Special Agent Dana Scully scans a chip (that had been found implanted in her neck and subsequently removed) at a grocery store checkout scanner, and iirc all the registers went berserk. So this is definitely a thing.