People have been kind of abusing Excel since at least the mid-90's, using it for all sorts of things that weren't its primary intended use. I know there are several sites dedicated to games that run in Excel. Despite the slow decline of the desktop, the Microsoft Office user base is still in the 100's of millions, and with that many people you end up seeing some pretty amazing and funky stuff. I've been selling a text-to-flowchart Excel add-in (FlowBreeze) for years, so I'm just as guilty as anyone.