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Mickey's Surprise Party (1939)
Minnie is baking cookies. When she leaves for a short while, her dog Fifi accidentally drops popcorn kernels in the dough. Mickey and Pluto come over and visit with Minnie and Fifi. When Mickey notices that something is burning, Minnie remembers the cookies, which are popping popcorn out of them. Minnie is upset and lies on her sofa crying. Mickey goes out and buys a large amount of cookies. He comes back and shows them to her and she is overjoyed.