I used to think that, while cartoon characters were fictional, they were actors in costumes, and that cartoons were made in the same way live action movies are.
A childhood belief about cartoons

others believed things like this
- I thought cartoons were real, I remember asking my mom why there were lines around the "actors" in a cartoon.— Steven Graziano
- I thought live-action films were very, very well-drawn cartoons.Anon
- I used to believe that the actors in movies were all acting live behind those big curtains in the cinema.— Courtney
- I thought Bonnie and Clyde were fictional characters.Anon
- When I was a kid I used to believe that cartoons were people dressed up in special costumes.— Sarah-Jane
- I used to think actors in movies sometimes had to actually die to make the movies look real.— Dero