(Some back-info for young people: When I was young, there were no such things as digital cameras. So if you wanted to see a picture immediately after taking it, you'd have to use a Polaroid camera. After you snapped a picture, a square sheet would slide out of the camera, and then the picture would develop on the square sheet during the next few minutes.)
As a child, my family would never let me see a Polaroid picture in the process of developing (they probably didn't
want me to get fingerprints on the pictures).
Consequently, I got the misconception that the pictures would be ruined if you looked at them before they were completely developed.
A childhood belief about technology

others believed things like this
- My friend believed that when lightening flashed, you better smile because God was taking your picture! — Linda from Southern California
- I used to believe that God looked exactly like the picture of Abraham Lincoln on an American penny.— Leah
- Huey Lewis's "Hip to be square" - in 3rd grade I could have SWORN it was "hit the beef square". ????Anon
- When I was about maybe...8 i used to think that picturesque was pronounced picture-skwehAnon
- When I first saw a picture of the human anatomy, I thought the brain was really snot.Anon
- i used to believe that shredded wheat was harvested from niagara falls because of the picture on the box— gord