The Xbox 360 was the first console I bought after becoming a PC gamer a few years prior, and oh, what a machine that was. I still remember sitting on my bed and staring in awe at the next-gen graphics in front of me as I sawed through Locust Horde scum in Gears of War. But before long, I was back on PC, and so it has been ever since. That's why this sleeper build is making my nostalgia gland do somersaults.
Reddit user RazQ_ has put a fully-fledged gaming PC inside an Xbox 360 Slim : "I happened to have a dead Xbox 360 slim console and this project was born as I half jokingly suggested we [the Redditor and their husband] should build a PC inside this console."
And so they did, and they've been living with this console-PC for over a year. They tell me it's still "running strong" though.