I used to think that huge blockbusters that are being heavily advertised were the only movies in the theaters, and all the regular public went to see them. The weird looking flicks were movies that only freaks, or "hill folk" as I used to call them (got that from my older sister) went to see those movies.
Think I learned my lesson the second I saw "Cool Runnings" (the first film I hated, which ironically the rest of my family loved)...
A childhood belief about films

others believed things like this
- I used to think actors in movies sometimes had to actually die to make the movies look real.— Dero
- I used to believe that if you kissed someone you HAD to marry them. Even in the movies.Anon
- I use to believe thar the movies were real— Dennis G
- I used to believe that the world was actually black and white. (As it is on TV in old movies)— han
- I thought that there was a law that all movies had to have a happy ending— Quatsch
- As a child I used to think that actors really died in movies.— Jordi Comendador