 The Road Runners only vocabulary, "Beep, Beep!", was inspired by  background artist Paul Julian (qv) who would make the sound while  rushing down the hallways of the animators offices. For this short,  the sound effect was produced by Treg Brown (qv) who used an  electronic horn called a Klaxon. When the gadget disappeared,  Mel Blanc (qv) mimicked the sound for the second Road Runner short  _Beep, Beep (1952)_ (qv). That sound effect became the standard for  all Road Runner cartoons thereafter.