The theme comes from It's Always Sunny in Philadelphia, the long-running FX sitcom that premiered in 2005 following five self-absorbed friends running a Philadelphia bar. Its cheerful, retro instrumental opening became instantly recognisable over the show's many seasons, and fans began reusing it online to frame their own chaotic behaviour in the same ironic style. Clips, memes and short-form edits now use those opening notes as shorthand for a shameless scheme, keeping the theme familiar to audiences far beyond regular viewers of the series.
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The upbeat opening theme from It's Always Sunny in Philadelphia, used in memes and edits to signal chaotic, shameless behaviour with a cheerful twist.
The clip is the bright, jaunty instrumental theme that opens each episode of It's Always Sunny in Philadelphia, built around a bouncy piano melody, light percussion and a playful, almost old-fashioned show-tune feel. It sounds cheerful and innocent, which is exactly why it works so well against the show's selfish, scheming characters and their terrible decisions. Hearing those first notes instantly sets up a contrast: something wholesome on the surface, something gloriously unhinged underneath. For viewers, it triggers instant recognition and a sense of mischief, turning an ordinary moment into the start of a ridiculous scheme.
