Marty McFly is the teenage hero of Back to the Future, the 1985 film in which he travels back in time and repeatedly finds himself in danger, and his frantic yell has become a widely shared scream meme. Clips of the scream spread through soundboards, reaction videos and short-form edits, where it works as shorthand for sudden fear or disbelief without needing any dialogue. It remains popular because the performance is instantly recognisable, even to viewers who have not seen the film, and because a single panicked yell fits almost any unexpected moment.