One German man badly wanted to play the canyon-carving racing game WipeOut in real life. So he reverse-engineered it with a gigantic, multi-level cardboard track he can race on with a video-equipped R/C car controlled by a real racing cabinet.
The attention to detail is incredible and it's not surprising the whole enterprise took them two months to complete. The track is great and the car is a nice touch, but it's building it into a real arcade cabinet and making it all work that's the most impressive part.
It's like WipeOut 3D in 3D! I just blew my own mind.