The line comes from Firefly, Joss Whedon's short-lived space western that aired in 2002, in an episode where Mal and Zoe rescue their crewmates and reflect on what that makes them. Fans quoted it long after the series was cancelled, turning it into a badge of honour for the show's loyal following and a shorthand for unlikely heroes. It still circulates in edits and reaction clips because the delivery is understated, quotable, and instantly recognisable to Browncoats and new viewers alike.