Diablo III Economy broken by an integer overflow bug

[John Dutson-Whitter]

https://webcache.googleusercontent.com/search?q=cache:minimaxir.com%2F2013%2F05%2Fstones-of-jordan%2F - link is to Google's cache of the article, as the original site took a bit of a friendly DDoS and has had to 403 the page, but it's an absolutely hilarious read, and a great example of how even the most minor of changes can make a massive difference to the performance of your product.