Mickey's Birthday Party is a Mickey Mouse short released 7 February 1942.
Minnie Mouse, Donald Duck, Goofy, Clarabelle Cow, Horace Horsecollar, and Clara Cluck throw a big party for Mickey. Minnie secretly assigns Goofy to bake a cake for Mickey. In the meantime, everyone else keeps Mickey occupied with playing music and dancing, and the mouse does a wild rhumba dance.
After several unsuccessful attempts at baking a cake, Goofy goes to the bakery and buys a cake instead. Everyone sings the birthday song and Goofy trips and accidentally throws the cake on Mickey, who smiles regardless.