I used to think that animated movies were actual people dressed up in costumes that made them look animated. Completely illogical.
After that was cleared up for me, and I knew that the actors were only involved with the voices, I thought that whenever I watched the movie, they'd have to read the script again and it would somehow appear on my TV. Like they were always just ready and waiting in the studio. I never wondered what would happen if two people were watching the same movie but started at a different time.
A childhood belief about cartoons

others believed things like this
- when i was little i believed that when we watched a movie people had to act the movie all over a gen.
— Emmer - When I was a kid I used to believe that cartoons were people dressed up in special costumes.— Sarah-Jane
- I used to believe that the credits at the end of a movie was a list of people in that were watching it.— jon_
- I thought that psychological torture involved forcing people to watch really sad movies!— Elviessa
- i used to believe that the people on TV could see me. i never watched tv without getting dressed first!— Katy
- I used to think that a movie is made in realtime. I tought that a 2 hour movie is made in 2 hours.— Alexander