As a child I could not understand why there were blinking red lights in the sky in certain places (on top of radio transmitting towers, but I didn't know that at the time). My dad told me they were there to keep airplanes from running into them. So I wondered why anyone would waste time building obstacle courses for the planes.
A childhood belief about aeroplanes

others believed things like this
- I used to think water towers were where everyone's uh...waste...went to from the toilets.— Stephanie
- Airplanes got places faster because it was actually a shorter distance up there.Anon
- I used to believe that the sky had stop lights and road signs floating about for the airplanes.
— LoonaSM's - My nephew, at around age three, used to say that airplanes trailing white exhaust were "airplanes on strings".— Mojo!
- my sister told me that bunkers on golf courses were for children to play in while their dads played golf.— Julie
- Once, at night time, I saw the flashing lights from an aeroplane and I thought it was a UFO.Anon