I didn't know how old certain movies actually were. I was quite surprised to find out in 2000 that Fantasia dated all the way back to 1940, since the live action footage of the orchestra was in color, and I thought that color film hadn't been invented until the 1960s.
A childhood belief about films

others believed things like this
- I used to think that everything was once in black and white untill they invented color tv.Anon
- I use to believe that the world was black and white until color was invented for television.Anon
- I used to think that black and white TV and movies had originally been in color, but had faded with age.
— Beth - In the mid 90's, I used to believe that babies who were born in the year 2000 would live forever.Anon
- I thought live-action films were very, very well-drawn cartoons.Anon
- I used to believe that an animated film meant that the film had live animals in it.— reverb