Leeroy Jenkins began as a World of Warcraft player character made famous by a 2005 viral video, in which a guild planning a careful raid in Upper Blackrock Spire was interrupted when Leeroy returned, shouted his own name and charged in alone, wiping the group. The moment became one of gaming's earliest viral memes and was later honoured in Hearthstone, where the Leeroy Jenkins card shouts the same battle cry when played. It has endured because the joke is instantly clear: total confidence, zero preparation and immediate chaos.