There comes a time in every alternative OS user's life when they decide they'd actually like to use a program that typically runs on Microsoft Windows. It happens less often (in my experience) as a Mac user, but eventually some tantalizing gaming experience or obscure utility will call across the void, and there's no way your 128GB SSD has enough room for a Boot Camp copy of Windows. In my experience, it almost never works, but it often almost works, which is still impressive.