I thought for the longest time that the movie "Letters From Iwo Jima" was called "Letters From A Two Jima". I didn't get why it was "a two", but when I finally figured out I was misreading it it made a lot more sense.
A childhood belief about films

others believed things like this
- From the first six letters of this word, I thought that “megalomania” had something to do with megalodons.— Enrico
- I used to think "Zed" and "Zee" were two different letters.Anon
- I used to believe that translating from language into language was only a matter of changing letters ! :) — EwS
- I used to think that a movie is made in realtime. I tought that a 2 hour movie is made in 2 hours.— Alexander
- For the longest time I didn't know that Spinal Tap wasn't a real group. No wonder I couldn't find their music.— Louis
- For the longest time I thought 90210 was a sitcom Anon