Watching the show "Real People" when I was about 3 or 4, I thought that show was the only one where the images were actual people--and all the rest were cartoons or puppets.
A childhood belief about tv shows

others believed things like this
- After watching a crazy TV show, I believed that aliens were real. I still have a little fear of them. — Niki005
- 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
- I used to believe that Off Air was an actual show, possibly about airplanes.— Gretchen
- I used to believe that there was an actual show, listed in the various guides, called "To Be Announced."— Donna
- i used to believe dragon ball z was real
and namek was in another dimension
and every show on tv was realAnon