Scan the QR Code in this print advertisement from Berkeley College and the reader will be linked to an error page (Directory Listing Denied - This Virtual Directory does not allow contents to be listed.). Whoops. I hope the college wasn't counting too much on this code/advertisement to draw people to the Open House, which happened yesterday.
2D barcode best practices state that campaigns need to be thoroughly tested on various mobile devices and with a variety of code reader apps (free and paid for) to confirm that the code works correctly and the contents of the scan resolve properly.
2D Barcode Litmus Test: FAIL