You occasionally find people talking about how they built their own computer. As in, actually purchasing the video card, sound card, RAM, etc. separately, rather than getting a pre-made PC. They decide how they want their computer, in terms of storage capacity, amount of memory, and how well it runs those high-end graphics on the latest games.
But this gets me thinking. What if they took that concept, building a custom computer, and did something crazy and unexpected with it? What if they took an old computer, and put all new stuff in it? It would be a brand new computer, with the outward appearance of Ye Olde Windows. (Or whatever operating system you happen to be using.)