Avada Kedavra is the killing curse from Harry Potter, one of the Unforgivable Curses in the books and films and most closely associated with Lord Voldemort and his followers. In the story it is cast with a flash of green light and causes instant death, which made it a shorthand for absolute defeat long before it reached short-form video. Clips of the incantation later spread through fan edits, reaction videos and soundboards, where its drawn-out delivery became a reusable joke for eliminating characters, ideas and rivals in seconds.