INARA: What did I say to you about barging into my shuttle?

MAL: That it was manly and impulsive?

INARA: Yes, precisely. Only the exact phrase I used was, “Don’t.”

Joss Whedon (b. 1964) American screenwriter, author, producer [Joseph Hill Whedon]

Firefly, 1×02 “The Train Job” [with Tim Minear] (20 Sep 2002)