The first appearance of Mickey
Steamboat Willie is in fact the first official appearance of the name Mickey Mouse in the Disney universe although it is in fact his third short film. It was also the first to have a soundtrack. Mickey finds himself a sailor on a steamboat where the captain gives him boring tasks like mopping the floor, even though he was initially in charge. During the boat ride Minnie and a lot of animals get on board and they all sing and play music using objects and all the animals present. A piece of this short film is used as an intro to all Disney cartoons today.