This sound comes from Star Wars: Episode III – Revenge of the Sith, in the scene where Obi-Wan Kenobi confronts General Grievous. Released in 2005, the exchange later became one of the most quoted lines from the Star Wars prequels, especially as prequel meme culture grew online in the 2010s. People still use it because the setup and response are instantly recognisable, easy to quote, and perfect for edits that need a dramatic greeting. It often appears alongside other cinematic reaction sounds such as Darth Vader NOOOOOOOOO!