Donald's Happy Birthday is a Donald Duck short released 11 February 1949.
Huey, Dewey and Louie earn enough money to buy their Uncle Donald a birthday present. Donald wants the boys to save their money for a rainy day. They manage to get the money back and buy Donald a box of cigars. Donald thinks the boys have taken up smoking and forces them to smoke the cigars. Suddenly he finds a card in the box wishing him a happy birthday. Donald is so ashamed that he shrinks to a tiny size and disappears through a hole in the floor of the tree house.