[banana_giraffe]

Or a QR-code paging system.

(I feel a little evil for even suggesting that)

[J5892]

The most interesting applications I've seen of QR-codes have been the most wildly impractical or useless.

When I still used my Pebble watch, my favorite watch face was just a QR-code of the time. So to tell what time it is, you have to scan your watch with your phone.

[banana_giraffe]

I love that idea. I couldn't resist mocking one up in Python:

https://pastebin.com/erFSAUvH

[J5892]

I love that it updates every second. It makes it that much harder to actually use.

[n3k5]

“Scan Code 22 and Press Button to Continue.”

(If you want to take a guess at what I'm referencing, spoiler alert — the URL itself contains a clue: https://web.archive.org/web/20160129014847/http://i.emezeta.... )