tl;dr:“This is the story of a catastrophic software bug I briefly introduced into the PayPal codebase that almost cost us the company (or so it seemed, in the moment.) I’ve told this story a handful of times, always swearing the listeners to secrecy, and surprisingly it does not appear to have ever been written down before. 20+ years since the incident, it now appears instructive and a little funny, rather than merely extremely embarrassing.”