When I was about four or five years old, I believed that if you looked behind the TV while you were watching a movie, you'd see a portal to the universe/world the movie takes place in. I'd always look behind the TV, hoping that I'd eventually see the portal.
A childhood belief about tv

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 - 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 used to think that a movie is made in realtime. I tought that a 2 hour movie is made in 2 hours.— Alexander
- When I was little I believed when an actor died in a movie, he died in real life.— Ben
- Until a few years ago, I believed this was a "doggy dog" world, rather than a "dog-eat-dog" world.— jemima
- I used to believe that EVERYTHING we did was being filmed for someone somewhere to watch as a movie— KatBird_27