and if you were an ocean, I'd learn to float

A lot of people have been talking about the excellent credit sequence to Juno, with the lovely hand-drawn typography, but what I really have it for is the song. All I Want Is You was written by Barry Louis Polisar, a children's entertainer/singer who began his career in 1975. He's also written such excellently-titled gems as "My Brother Thinks He's a Banana," "He Eats Asparagus, Why Can't You Be That Way?," "The Dog Barked: A True Story," and "Don't Wake Up The Baby or The Baby Will Get You."