A number of the QR codes posted around the Melbourne CBD have been overlaid with alternative codes.
These codes, which the ABC has seen, lead to a documentary about hip hop culture on YouTube.
Melbourne Lord Mayor Sally Capp said it was not yet known how many of the QR codes had been vandalised, but believed it was still small in number.
"The hacking of the QR codes is so frustrating," the Lord Mayor said.
Tee Hee.