Can Timmy Turner make a wish to cure The Joker's insanity?

Well yes, as I understand, Timmy Turner and his Fairy Godparents can do anything, though I haven't watched the show fully, I have seen bits and parts. I also am aware of the fact that there are rules the Fairy Godparents have to follow. read more

When he tries to be more specific ("I wish Trixie Tang loved Timmy Turner"), Norm makes it so Trixie Tang loves everyone named Timmy Turner. It's the third and final wish that outs Norm as an outright Jackass Genie; Timmy wishes for his Dad to be a billionaire, and Norm makes Mr. Turner a counterfeiter. read more

Fed up, Timmy tries to wish Gary back into his mind, but Gary being a part of Timmy, is able to wish him there as well. This leads a Battle in the Center of the Mind that Timmy is able to ultimately win by thinking up a mosnter sized version of Vicky to eat Gary whole. read more