After I beat Wind Waker I let a friend borrow it, and while he had another game, I started a new one too and named Link "Poop!" It was the most hilarious thing ever.
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Hey I once played OoT with Link named "ButtMunch", and it really was the greatest time I ever had with the game! I've also tried "ILikePP" so that when people address me in the game it sounds like they are saying that they like pee pee, and uh... I think I tried "Poopy Pants" before.