When I was young, my parents and I often slept over at my grandpa's house; just something fun to do. His house at that time was very close to an airport, and planes often flew low overhead.
Around the time of one of our first sleepovers, I had just heard the story of Moses and the plagues at Sunday school. Specifically, we had read the story where the Angel of Death passed over Egypt, and killed the firstborn in any house that did not have lamb's blood over the door.
I was lying in bed at Grandpa's house that night. It was an especially busy nght for air traffic. I was convinced that the roaring noise I was hearing (plane engines) was the Angel of Death flying over us.
No one in the house got much sleep that night, as I was awake crying in terror that the Angel of Death was going to kill me.
A childhood belief about aeroplanes

others believed things like this
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- 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 used to believe that when we went to bed at night, all the animals in our house talked to each other. Anon