Donald's Dream Voice is a Donald Duck short released 21 May 1948.
Donald Duck is a door-to-door brush salesman, but his customers have trouble understanding him. He comes to a street vendor selling voice pills, and buys some. The first one works great, but he trips and spills all but one of the rest. He wants to use the last pill to impress Daisy, but drops it too, and chases it across town as it lands in unexpected places.