The line comes from Serenity, the 2005 science-fiction film that continued Joss Whedon's television series Firefly, and is spoken by Captain Malcolm Reynolds, the ship's independent-minded captain. In the film it sums up his refusal to submit to the Alliance, the powerful government pursuing his crew. Fans adopted the phrase as a motto for the show's free-spirited attitude, and it later spread through fan edits, reaction videos and soundboards. It endures because it is short, quotable and instantly signals playful defiance without needing context from the film.