If you subscribe to the many-parallel-worlds theory, there's some version of Earth where Nintendo and Sony joined forces to create the Nintendo PlayStation.
The two companies got as far as producing development hardware on which games would be developed for the hybrid Super Nintendo/CD-ROM system, and even produced a controller that eventually became the PlayStation pad.
An eBay auction this week purports to have just one such controller, a six-button version that I remember seeing in some Next Generation article or something somewhere, for the Buy It Now price of $3000.
Certainly a rare opportunity to own a piece of gaming history, unless of course it's a very clever fake. The seller doesn't offer any information that would vouch for its authenticity, only saying that he "did not make it" but neither did he "find" it.
http://blog.wired.com/games/2008/01/auction-watch-o.html
