I know a dealer who has been the Upper Deck rep for signings and he told me this thing is pretty common. UD filters them out when they get them back though. I think this is probably real but as mentioned you can change the signatures very easily on stickers so the value would be simply for the joke factor and pretty minimal imo.
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WTB: 2001 Leaf Rookies & Stars Longevity: Ryan Jensen #/25
1994 Pro Line Live
TheDallasCowboyBackfieldProject
1994 Pro Line Live
TheDallasCowboyBackfieldProject
I think it would draw a huge premium if it went viral like. That kind of stuff ends up on Leno. I don't even think it's grade would even matter