In "The Wizard of Oz", when the movie changes from black and white to color, I used to believe that color film had been invented right then, while they were filming the movie. Of course, at the end when it changes to black and white again, it was because they only had so much to go around and the people filming Thw Wizard ran out, so they went back to black and white film.
A childhood belief about history

you weren't the only one
564 of you believed this
- After I saw the Wizard of Oz, I was under the impression Kansas was black and white.Anon
- Before the invention of the camera, everything looked like a cartoon with the quality/effect of oil painting.— MD Caruso
- after watching "the wizard of oz" i thought kansas was black and white and the rest of the world was color!— kelly
- I use to think polka dot was a color.Anon
- I thought the world was black and white because of all the smoke from the bombs in Second World War.— Bjoern
- I used to believe that my grandparents' world was in black and white.— Sara Serés