There are even a couple of exercises in Warner Brothers-style show business self-reflexivity among them : the irresistible " Donald 's Dream Voice " ( Jack King , 1948 ) , in which Donald takes a pill that makes him sound like Ronald Colman , and " Donald 's Dilemma " ( King , 1947 ) , in which a crack on the head from an errant flowerpot turns him into a Sinatra-like crooner .