Steel Battalion? One of the best games to ever hit the original Xbox. It's a game where you control a giant mech using two joysticks, three foot pedals and a 40 button controller that came with every game. Steel Battalion was great, but the huge price tag prevented a lot of people from experiencing it.
The controller doesn't have any use outside of Steel Battalion, but Japanese VJ, Bonsajo, modded his into something useful. His controller mod allows him to fade, scratch, change color and do all sorts of other things to images appearing on the screen that I don't really fully understand why but STEEL BATTALION!