A 2-chicken-nugget bonus
This story doesn’t really involve exploiting a loophole. Rather, it’s about a person whose love for BK chicken nuggets forced them to do some quick math. And quick math they did, very, very quickly. After looking at the menu, they discovered that two 5-piece nugget packages were cheaper per nug than getting a 10-piece box.

So, instead of opting for the “value” pack, this high-IQ-ed shopper went with the two 5-piece meals every time, scoring themselves free chicken nuggets in the process. We’re not sure who had the final laugh. Was it the person who “exploited” the value pack or the mega corporation who sold more nuggets?