Or my favorite example: that at one point, the Rails inflector would singularize "police" as "polouse."

Everyone once in a while a product manager will get familiar with the Django admin page of an app I'm working on and say something like "What? Why does it say Companys? Is there something wrong with the app?"

My response is always (some diplomatic, lay version of), "No, it's correctly refusing to involve us in the game of guessing how the framework developers modeled plurals."