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When you were growing up, your parents probably took one look at your Pokémon cards and performed a huge eye roll. They might have told you to stop wasting so much time on them because they're never going to put a roof over your head or food on your plate.
Well, sceptical mums and dads around the world, you were wrong.
Admittedly, Gary doesn't have a collection of Pokémon cards consisting of Goldeens, Magikarps and Mr Mimes. Appearing on Pawn Stars, he claimed to have world's number one arsenal of cards contained inside a metal case.
Gary has some of the rarest and most sought-after cards on the planet and they're all Charizard.
He first came across the wild and wonderful world of Pokémon when his sons got into the franchise. His kids eventually grew out of the craze, as we all did, but Gary persevered and made a hobby for himself in finding and collecting rare cards.
When poor Gary appeared on the History Channel's reality TV programme, however, the bloke he was dealing with had no clue what on earth Pokémon was - you could tell from the moment Gary pulled out his collection that pawn shop co-owner Rick Harrison was dumbfounded.
He even called over to his Pawn Stars teammate Austin Russell to see if he knew anything about 'Pokéman'.
Rick pulled in the big guns, in the form of Rogue Toys owner Steve Johnston, to help explain how a bloke thought he could get any money whatsoever from a Japanese card game.
He said: "So Pokemon started in Japan in 1995 - probably around 2000 to 2002 when it really took off. So that's why these first edition cards are really hard to find, because you still hadn't created this large market for what it became.
"Charizard is one of the best characters in the game. He's also one of the most collectible characters in the entire Pokéverse."
Gary claimed to have a few Pristine 10 level Charizard's in his collection, which are incredibly rare.
One card alone was estimated to be worth $30,000-40,000 (£21,600-28,800) and Gary looked particularly chuffed about the appraisal and at Rick's face, who still couldn't wrap his head around the card's value.
But that smile quickly faded when Mr Johnston gave his estimate for the full collection at around $380,000-390,000 (£273,500-280,800).
Most people would be bloody thrilled that a few pieces of cardboard could net more than a quarter of a million dollars, but Gary was hoping it would hit the half a million mark.
His mood was sent even further south when Rick Harrison refused to make him an offer for the cards on the basis that he knows naff all about them, and wouldn't be able to resell them to a customer.
Hard luck, mate.
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