The line comes from Looney Tunes Intro Bloopers 61, a fan-made blooper-style episode built around the classic Looney Tunes intros, in which Dave Madson confronts Sam over an action he calls murder. As a short, self-contained quote, it was easy to lift from the episode and share as a standalone sound, where its blunt wording made it instantly reusable without any extra context. Editors keep returning to it because the phrase works as a universal warning, turning an everyday mistake into a mock-serious crime in a single sentence.