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You can shut down all sorts of things with the EICAR string encoded as a QR code.

See: https://en.wikipedia.org/wiki/EICAR_test_file

and this video https://www.youtube.com/watch?v=cIcbAMO6sxo where all the gates at a parking garage are rendered inoperable because someone scanned a QR code that encoded EICAR

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.

It's amusing that you are using an X-Files episode as if it was factually true.

You could stick the barcode on tons of random items in the store.

I suppose it would be considered vandalism. "but i just scanned a barcode" will not amuse the judge.

If nothing else, the store could ban you and have you arrested for trespass if you ever came back.

You could just print them on stickers and put them on random items.