I used to think that aeroplanes were called "arrowplanes" because they were shaped like an arrow.
A childhood belief about aeroplanes

others believed things like this
- 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
- I used to believe that the oddly-shaped clouds were made from oddly-shaped sheep— Dickson
- When I was little, I believed that aeroplanes were sent into the air by giant slingshots.— Now I Know Better
- I thought the dog poo in the street was human poo dropped from aeroplanesAnon
- That the white stuff coming out of aeroplanes meant that someone on the plane had just got married.Anon