As a child I believed the sky was a solid blue layer. It was quite obvious therefore that vapour trails were where planes scratched the sky.
A childhood belief about aeroplanes

others believed things like this
- When I was a child, I used to believe that clouds were solid and that you could walk on themAnon
- i believed like when i was 3 yrs. old i thought that air planes would come to your house to pick you up!— Brooke
- I believed that Jesus was flying across the sky, it was actually sunlight reflecting off planes.— Patti
- The song "Reverend Blue Jeans" turned out to be "Forever in Blue Jeans." Who would have believed that?— music lover
- I used to think that the trails that Airplanes left in the sky, that's how clouds were made.Anon
- I used to believe that being a tiger would be a job like plumber or layer. It was my dream job.— Dom