In the UK, there's a programme called "It'll Be Alright On The Night" and it shows out-takes and bloopers of other tv programmes. Whenever I watched it, I thought that when an actor got his or her lines wrong and started laughing, I thought it was because somebody had told them a really funny joke at lunchtime and they were laughing at it. Subsequently I thought that all of the out-takes and bloopers took place in the afternoon. Hmmm....
A childhood belief about tv shows

others believed things like this
- I used to believe that when sheep die, god takes their wool and makes it into clouds— Oded
- I used to believe that these big, strong men would be on each side of an airplane to push it when it takes offAnon
- Me & my brother used to think that the science programme QED was called "KWED" rather then "KYOO EE DEE".— Richard Davies
- I used to think that the laugh track on sitcoms were the camera men, directors, other actors, ect. laughing.Anon
- I heard the song about Heaven being a place where nothing ever happened and thought, "What a boring place."Anon
- We would drive by UNION BANK here in California and I would say "Onion bank!" My Mom would bust up laughing.— BINGO