This gave birth to a tongue in cheek project, Mcpisser, an open source repository of all the McDonalds toilet codes in London, updated by those who had bought food at one time for those that needed the toilet another.
I created a variety of QR codes and NFC stickers that could be printed at home and placed by contributers around their local restaurants. The website facilitated the process of gathering and distributing codes, with pages to handle failures and new users, free gmail accounts and autohotkey used to publish new information.
For legal reasons this whole project was definitely just a joke and definitely never deployed in the real world.
© Callum Cooper 2026