For a hefty $25,000 on eBay, you could land a rare Nintendo World Championship gold cartridge. For those who don't already know, only "26 of the 119 produced cartridges are gold - like the Legend of Zelda cartridge - and were given out to winners and runners-up in a contest held by Nintendo Power magazine." Auction page.
To play the cartridge, one must have a controller connected to both controller ports and press start on the second player's controller. For the competition, there was a special switch that would start all cartridges simultaneously.[via eBay - Wiki]
