I used to love fighter jets when I was a toddler, and figured that they went so fast because of the flames that came out of the afterburner. One day my cousin and I made several dozen paper airplanes and lit the backs of them on fire, fully expecting them to dart out of our hands...didn't really help the speed of the plane but it looked cool. And nothing went faster than when my grandfather saw a smoldering pile of paper airplanes. My theory was close, just a little misguided...
A childhood belief about aeroplanes

others believed things like this
- I used to believe Airplanes were things that made air plane- like took out scents, took out impurities, etc...— Emile
- My nephew, at around age three, used to say that airplanes trailing white exhaust were "airplanes on strings".— Mojo!
- Airplanes got places faster because it was actually a shorter distance up there.Anon
- I used to think that the trails that Airplanes left in the sky, that's how clouds were made.Anon
- I used to think that the sound made from airplanes flying over me was the antenna scrapping across the sky.— Richard J Brown
- when i was little, i used to believe that airplanes goes out of space.Anon