I was shockingly old - in my twenties, even - when I finally understood the joke "What's black and white and read all over?" "A newspaper"
Of course, written down, it's not so tough to work out...
A childhood belief about speaking

others believed things like this
- I thought that old movies were black and white because the world was black and white then. — K
- I used to think that the old days were actually black and white because of the old black and white pictures.— Leigh Taylor
- When I was little I used to believe that black people saw in black and white. — Chelsea
- when i was litte
I used to believe that white people had white blood and black people had black blood.Anon - I used to believe that old people saw in black and white. Anon
- behind the times ment behind the newspaper!!!!!!!— Neon Anon