Oh, maybe adversarial salaries. You each, meticulously, go through the others code, trying to find as many bugs as possible, in your spare time. Each bug you fi

Oh, maybe adversarial salaries. You each, meticulously, go through the others code, trying to find as many bugs as possible, in your spare time. Each bug you find transfers a percentage of their salary into yours. End result: everyone's code is perfect, and everyone hates each other. :D