The line comes from Masters of the Universe, the 1980s animated series created by Filmation, where Prince Adam raises the Sword of Grayskull and transforms into He-Man. As he holds the sword aloft, he declares 'I have the power!' and the transformation sequence became one of the most recognisable moments in 1980s cartoons. Clips of the scene spread widely online as a meme for strength, confidence and sudden success, and creators still use the short shout today because it instantly signals a hero moment without needing any explanation.