Mad World began as a song by British band Tears for Fears, released in 1982, and gained a second life through Gary Jules's stripped-back piano cover for the 2001 film Donnie Darko. That quieter version became closely associated with sadness, reflection and dramatic irony online, spreading through edits, montages and reaction videos long after the film. Short clips like this one are now reused as shorthand for a sudden emotional turn, especially in short-form video where a few piano notes can signal that a joke, story or reveal has taken a serious direction.