In the Looney Tunes short “Duck Amuck,” Daffy Duck does something rare for a cartoon character: He breaks the fourth wall.
What else is he to do, when the off-screen animators are clearly playing tricks on him? Within two minutes, Daffy is thrust from a Three Musketeers parody into a barnyard scene, then a winter wonderland, and finally a Hawaiian paradise—before the setting leaves entirely.
“Look, Mac,” he...