OK. It used to be funny. Now it just underlines how ignorant you are. Every time I see some knave repeating the "666 the Mark of the Beast is in UPC barcodes" urban myth I just want to gag.
Now repeat after me: 666 isn't part of UPC barcodes. Never was, never will be. There is no plot by Satan, the Devil, the Pope, or your ex- to use barcodes to a.) steal your soul, b.) further The Dark One's agenda or c.) activate the metal plate in your head. And no, UPC barcodes have nothing to do with the metal probe the aliens stuck up your ass that night.
So stop misquoting Revelation 13:16-18 you nitwits. I know where you live.