Yu-Gi-Oh! episode 63: "Playing with a Parasite, Part 1"
Weevil promised the boy a rare card if he could sneak the card "Parasite Paracide" into Joey Wheeler's Deck. The boy claimed to be a fan collecting autographs from skilled Duelists. He then asked to hold Joey's Duel Disk and promptly ran away with it when Joey consented.
While being chased by Joey, the boy slipped the "Parasite Paracide" into Joey's Deck. He was caught by Joey's friend, Tristan Taylor, and explained that he took the Duel Disk to become a Duelist.
The boy met up with Weevil and told him that the plan was a success. Weevil gave him a common "Gokibore" card as compensation, making him protest that Weevil had promised him a rare card. In response, Weevil attacked him with a spider-shaped gun that shot silly string.