On Wednesday, two 14-year-old Canadian students spent their lunch break hacking an ATM and notifying its owner, Bank of Montreal (BMO).

Caleb Turon and Matthew Hewlett had previously dug up an old ATM manual on the internet that showed how to access operator mode, according to a Sunday Toronto Sun report.

The ninth graders were shocked when prompted for a password to access operator mode, and even more shocked when the system accepted a six-digit default password.

The white hat hackers promptly notified BMO, but were only taken seriously by staff after they went back and altered the machine's greeting, changed the surcharge to one cent, and printed off documents containing information on the ATM.

The bank addressed the issue, and wrote a note explaining why the students were late returning from lunch.