When i was a kid (about 5 years of age) i thought that the white lines that came from the back of the aeroplanes was the passengers spitting from the windows.
I still have no clue about why i though like that.
A childhood belief about aeroplanes

others believed things like this
- That the white stuff coming out of aeroplanes meant that someone on the plane had just got married.Anon
- I used to believe that if I didn't jump the white lines of the zebra crossing I would dieAnon
- I thought the dog poo in the street was human poo dropped from aeroplanesAnon
- I used to think that aeroplanes came to your house to pick you up.Anon
- I used to believe that aeroplanes could reverse when they are flying. Anon
- When I was little, I believed that aeroplanes were sent into the air by giant slingshots.— Now I Know Better