I used to believe Superman flew because in the movie, he was flying.
A childhood belief about cartoons

others believed things like this
- I used to believe that the Lehigh tunnel in Pennsylvania was created by Superman.— Holz
- I used to believe that I could fly like Superman if I had the right cape and got a good running start. — Rick
- I always wanted to use the telephone to call Jesus, Santa and Superman— Alex Burghart
- My friend managed to convince a gulliable kid at various stages of school that he was superman and a robot.— naff
- My mom told me when i was little, that the Easter bunny and Superman lived togethor in Detroit at the park. — someone
- I used to believe the dead flew up to heaven.— Pierre, a French student in eighth grade