Unfortunately unless you have some proof of authenticity, the signature doesn't add anything to the value of the shirt.
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My son... gives me Helpful Nintendo Hints that are far too complex for the adult mind to comprehend. Here's a verbatim example: "OK, there's Ganon and miniature Ganon and there's these things like jelly beans and the miniature Ganon is more powerfuller, because when you touch him the flying eagles come down and the octopus shoots red rocks and the swamp takes longer." And the hell of it is, I know he's right. - Dave Barry
