The clip comes from League of Legends, the multiplayer online battle arena game released by Riot Games in 2009, where the in-game announcer calls out multi-kills as they happen. A pentakill means one player has eliminated all five opponents in quick succession, the rarest and most celebrated streak in a match. The announcement has become shorthand in gaming videos, streams and memes for a flawless run, because even players who do not play League recognise the rising excitement of the call and what it represents.