The sound comes from LaBeouf's 2015 performance art piece 'Just Do It', filmed in front of a green screen and released as part of a student project, where he delivered an intense motivational speech directly to camera. Clips of the speech were quickly cut, remixed and shared across YouTube, Vine and later TikTok, turning the phrase into a shorthand for self-motivation and parody. It remains popular because the delivery is instantly recognisable and works as both sincere encouragement and comic overstatement.