My Dad had me convinced that the "First-Down Line" on the screen during football games on TV was painted on by a guy who ran across with a yellow paintbrush real fast, and when it was time for the line to disappear, he had to run back down real fast again and paint it green to match the grass again. He was the fastest runner because he couldn't get in the football players' way and interfere with the game. I never paid close enough attention and didn't catch the line actually appearing/disappearing until I was 14 years old, what a shock that was! I was amazed that my dad kept it going for so long.
A childhood belief about tv

others believed things like this
- I used to think that the line in the song "Life in the Fast Lane" was "Fights in the Bat Plane".Anon
- When I was little, I used to believe that football players really had shoulders that big.— Angie
- When I was a child I used to believe that when I played video games my real world changed like the game. — J
- I used to believe that a "punch line" meant a line of people waiting to dip punch from a punch bowl.— Sheila
- I used to believe that if you mixed red, blue, green, and yellow paint you'd get plaid!— Judith Ann
- I believed I could tap dance by moving my feet real fast. — Aussie