Asked to discuss the violence in Road Runner cartoons, Mr. Jones quickly replied that ”there was nothing we ever did that wasn’t preceded by something in Chaplin or Keaton.”
”Everyone in America under the age of 45 grew up on our cartoons,” he said. ”Now, do you think they’ve been damaged by them?”
”And we had very strict rules about Road Runner,” he added, citing the list in his book, which includes the following: (1) The Road Runner cannot harm the Coyote except by going ”beep beep.” (2) No outside force can harm the Coyote - only his own ineptitude or the failure of the Acme products. (3) No dialogue ever, except ”beep beep.” (4) The Road Runner must stay on the road; otherwise, logically, he would not be called Road Runner. (5) All materials, tools, weapons or mechanical conveniences must be obtained from the Acme Corporation. (6) The Coyote is always more humiliated than harmed by his failures.
from “Chuck Jones on Life and Daffy Duck”, New York Times, November 7, 1989