http://cgi.ebay.com/SNES-CD-dev-controller-Playstation-unreleased-RARE_W0QQitemZ230206949163QQihZ013QQcategoryZ62053QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Check out this eBay auction for a controller for a system that never existed. This controller was a prototype for the development kit of the Nintendo/Sony Super NES CD System.
The controller has both Super NES elements and prototype PSX elements (triangle shaped start button).
Warning.... the price is, well, expensive. And it should be.
Wii Code 3456 7941 4060 2924