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Nightmare Fuel - In September 2010, Johto was blanketed by fog and Psychic- and Ghost-type Pokémon gathered. The result was lasting nightmares for anyone who fell asleep before the fog lifted. And some of them were downright awful.
And then there was the Missingno event around Halloween. Skeletal Aerodactyl and Kabutops running around with standard Missingno while the whole world and all NPCs turn pixelated? Brrr.