created  originally named mortimer walt disney changed name because wife convinced him mickey mouse become staple disney brand always thought cartoon first ever cartoon feature mickey fact third matter six minute animated short enjoyable story sees mickey piloting steamboat captain pete takes bridge stopping pick cargo minnie mouse missing boat lifted drops music sheets goat eats them mickey helps crank tail play tune getting animals percussion pete comes along stop him making mickey peel potatoes mickey mouse number   greatest pop culture icons number   greatest cartoons good