The 'Vaporeon Copypasta' is a notorious block of text that first appeared on 4chan's /vp/ board around late 2018. It details an absurdly clinical and long-winded argument for why Vaporeon is supposedly the most 'compatible' Pokémon for humans based on its biological stats and abilities like 'Acid Armor.' While deeply controversial and often used for shock value, the meme evolved into a meta-joke where users subvert expectations or react in horror to the initial 'Hey guys, did you know...' prompt. It serves as a staple of internet shock culture and remains one of the most recognizable, albeit polarizing, pieces of Pokémon-related lore on the web.