I used to think that cartoon characters were people in costumes. I had a terrible time figuring out why my Hallowen costume was different from the cartoons on TV. I also remember wanting to be Ms. Piggy from Muppet Babies when I got older. (I have no idea why).
A childhood belief about cartoons

others believed things like this
- When I was a kid I used to believe that cartoons were people dressed up in special costumes.— Sarah-Jane
- I thought cartoons were real, I remember asking my mom why there were lines around the "actors" in a cartoon.— Steven Graziano
- I used to think that "cross-eyed" meant that people had X's for eyes, like dead people in cartoons.— Tim
- I used to wonder why people didn't have outlines like they did in cartoons.— Anna
- I used to believe cartoons were real people and animals. They were just wet.— Wendy
- I used to believe cartoons where real people. You can imagine how that went... — Emma