Simon has started contracting the phrase "I am not" as "I amn't." E.g., "I amn't going to bed right now." "I amn't a goofy kid." When I start to correct him I become tripped up by the fact that what he's doing is just applying rules of grammar in a completely logical way, even though we're used to putting the contraction someplace else in the sentence. He'll figure it out. I amn't too worried about it.