I had always assumed that although I understood only about half of what Donald Duck says in his cartoons, Americans understood everything despite his comical pronunciation.
However friends have just offered me DVDs featuring Donald and one 1948 episode, "Donald's Dream Voice", hinges on the fact that he can't sell brushes—he is a sales representative—because nobody understands him (until he buys pills that give him a human voice).
So my question is: do native speakers in the USA actually understand Donald's squawking (but delightful) English?