This particular glitch was a favorite to many younger players back in the heyday of Pokemon Red and Blue, allowing overzealous completists the chance to brush with the illusive "glitch Pokemon" Missingno. and a host of other strange phenomena. Activating the glitch requires you to learn from that wily old man how to capture a Pokemon, then immediately flying to Cinnabar Island to surf along the edge of the island, up and down, until a Missingno. or other encounter occurs. Koffing's eye, random tech noise, and other strangeness comprise Missingno.'s body, and if you play your cards right you can use these odd encounters to duplicate items like Rare Candies or Master Balls. Mess up, and you could end up corrupting your save file while indulging. Luckily we've never gone that far while living on the edge.