Comics and animation illustrators know that sometimes, the most efficient way to get a panel or frame just right is to "swipe it" — copy it from somewhere else where it worked before, then change it to fit. Disney's illustrators are no exception, as this collection of animated GIFs amply demonstrates. As Picasso said, "amateurs plagiarize, artists steal." (He stole that from someone else, of course).
Some other swipes from Boing Boing history: