There was a tweet a while back where I guy was riding a train in China and took a photo of the QR code for his seat. He mentioned that you can use the QR code to order food and drinks delivered directly to you.

About 5 minutes later there was another tweet from him where:

- someone saw the original tweet (Guy 2)

- scanned the QR code

- ordered the OP a drink

- added a note to the order saying it was from Guy 2

Always loved this story.

A cautionary tale if your QR Code® is a ticket for the big show, or opens up your HIPAA portal somewhere

QR Code® is [sic] registered trademark of DENSO WAVE INCORPORATED.