My friend and I played his landlord's Nintendo (like the original deal) for the first time last weekend and we found something surprising. When we inserted the Zelda cartridge, the game Duck Hunt came on, and when we inserted Duck Hunt, Zelda came on. The cartridges looked real and untampered and we had the boxes from them also. Is this a rare occurrence? How could this have happened?? If it's really rare, I'll put the video I took on youtube.