The claim that every UPC barcode hides 666 in its three guard bars, the mark of the beast printed on everything you buy.
Documented
The inventor's answer
Laurer designed the UPC at IBM, first scanned in 1974. Its beginning, middle, and end guard bars share a pattern resembling an even-parity six, which Laurer acknowledged while denying intent: there is nothing sinister, he wrote, it is a coincidence like my first, middle, and last names all having six letters. The bars exist so scanners can orient the code.
Assessment: Documented: the inventor's published answer. Resemblance conceded, intent denied, function explained.
Stories
A mark on all buying and selling
Protests met the first grocery scanners in the 1970s, and Laurer once received a registered letter from someone claiming to be Satan, asking how it felt to carry out his orders. The legend welded Revelation 13's mark, without which no one may buy or sell, to the one technology touching every purchase.
Assessment: Stories: the prophecy said buying and selling, and here was a mark on everything bought and sold. The rhyme was too good to check.
Interesting claims
The variant under the verdict
A footnote the videos skip: the oldest extant manuscript of the passage, Papyrus 115, third century, reads 616, not 666, and Irenaeus was already denouncing the variant in the second century. The beast's digits are themselves unstable.
Assessment: Interesting: reading 666 off a scanner is a second-order reading of a number the manuscripts do not agree on.
Sources and further reading
George Laurer, inventor's published Q&A on the guard-bar resemblance and his six-letter names
Wired, Dec 2012, 'Why the Bar Code Will Always Be the Mark of the Beast'