The line comes from World of Warcraft: Cataclysm, released in 2010, during the Silverpine Forest questline where Warchief Garrosh Hellscream confronts Sylvanas Windrunner over her use of the plague and the Val'kyr to raise new Forsaken. The exchange became one of the most quoted Horde scenes from that expansion, shared in forums, machinima and soundboards because Garrosh's blunt delivery summed up the growing split between the two leaders. It remains popular as a reaction clip whenever a stern, in character warning fits better than a generic alert.