The sound comes from Mutant Enemy Productions, the company founded by Joss Whedon, whose closing logo appeared at the end of episodes of Buffy the Vampire Slayer and Angel. The logo paired a shambling monster figure with a guttural growl and the on-screen words Grr Argh, turning a production credit into a small joke in itself. Fans began lifting the audio for edits and tributes, and it has stayed in circulation because it instantly signals Whedon's work and a knowing, tongue-in-cheek ending.