The quote comes from Obi-Wan Kenobi in Star Wars: Episode III – Revenge of the Sith, released in 2005, during his duel with Anakin Skywalker on Mustafar. It became one of the most repeated lines from the prequel trilogy and spread widely through image macros, video edits and reaction memes. People still use it because the phrase is instantly recognizable and works as shorthand for having a tactical advantage, especially in gaming clips, argument memes and scene parodies alongside lines like Darth Vader NOOOOOOOOO!.