There's an achievement you can get in Gears of War 3 that can be earned by playing a piano 2000 times. That's a lot of button pressing, so LEGO builder Guy Himber set to work on a less strenuous solution.
He built this LEGO rig that would both hold his 360 controller and press the required buttons, at a rate of 34 times a minute. This means he was able to "earn" the achievement in around an hour.
Sure, it's cheating, technically, but the word cheating makes it sound like he broke the game. This thing isn't just cool, it probably took longer to build than it would have taken to press the buttons manually, making it totally OK in my books.
V&A Steamworks' photostream [Flickr]
Gears of War Lego Hack [MAKE]