"Wile E. Coyote was attempting to heave a boulder over a cliff"

 Wile E. Coyote is a cartoon character that appears in a series of Looney Tunes cartoons alongside his arch nemesis, the Road Runner. Throughout the cartoons, the starving coyote comes up with ever more elaborate plans to trap the Road Runner, only to have them backfire on him in spectacular fashion.

According to the cartoon's creator, a set of rules was put in place that frame a strict formula for each cartoon. The Road Runner never actively harms Wile E. Coyote, who is spurred on in his pursuit only by his fanatical obsession with his prey. The harm that comes to the coyote at the end of every cartoon is therefore of his own creation, or as a result of faulty Acme goods.