For many years, I believed that all television shows (except cartoons) were performed live in real-time. I also harbored a belief that the people on the television could see you through the screen, but didn't react (because they were professional actors, after all).
A childhood belief about tv

others believed things like this
- I used to believe that actors were little people that lived inside the television set.Anon
- I used to believe that I could jump through the television and be where the people were on television.— Ash
- I used to think all television shows were made at the tv station on the hill of my home town. — Monique
- last time when the television was on i thought the people were performing in it -.-
— irritated kid - 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 believe that before color television the real world was in black and white. — Chris