When I was little, I swore that cartoons were in color even though our TV was black and white. But other non-cartoon shows were black and white. My folks told me it wasn't possible for just the cartoons to be in color but I thought they were nuts.
A childhood belief about cartoons

others believed things like this
- When I was a kid I thought that when my parents were kids, the world was black and white and had no color...— KKM
- 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
- after watching "the wizard of oz" i thought kansas was black and white and the rest of the world was color!— kelly
- 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