Beer!
Well personally I think he deserves one!
A cunning Polish developer has hacked an Android food and drink rewards app to grant himself unlimited free beer. Kuba Gretzky detailed his excellent exploits in a blog post on Breakdev – though, to deter copycats, he didn't name the rewards app or the precise location within Poland where it was operating. He did, however, …
I once worked for a bunch of Irish guys (I know stereotypes) who often would come over here to our site, the owner considered himself an accountants accountant, and it was expenses all the way and trips to the UK were an excuse for him to have a few on company money, meetings where often slightly sozzled.
When I left I spent so much time with them in pubs, that in my next job I tripped over, and first thing that came out of my mouth was Feck.
The first generation McDonalds app in the UK used to offer freebies from time to time - a coffee, an ice cream etc. Sorry, a McCoffee or a McIceCream. Anyway, it would clearly store the fact you'd redeemed it within the app itself and the second time you tried, would just say no.
Apparently, the app devs had never read the docs around "Clear App Data" in Android, which would grant you another freebie. Didn't pay for coffee for weeks.