Leeroy Jenkins comes from a 2005 World of Warcraft video in which a player shouts his character's name and charges into a dungeon encounter while his guildmates are still planning, wiping the whole group. The clip spread through gaming forums and early video sites because the reckless charge was both instantly funny and painfully familiar to anyone who had played in a group. It later became a lasting gaming catchphrase, referenced in other games and online videos, and it still works today because it captures the exact moment a plan falls apart.