I also used to believe that when shows appeared in black and white that the TV was just broken. At one point in my childhood my cousin had told me that I had turned the color off on the TV by pushing the wrong button and that I'd be in serious trouble when she told my mother. What a mean trick! :P
A childhood belief about tv

others believed things like this
- I used to believe that before color television, people only saw in black an white.— CD
- I used to think that everything was once in black and white untill they invented color tv.Anon
- I used to think that black and white TV and movies had originally been in color, but had faded with age.
— Beth - I used to believe that before color television the real world was in black and white. — Chris
- I use to believe that the world was black and white until color was invented for television.Anon
- When I was a kid I thought that when my parents were kids, the world was black and white and had no color...— KKM