My parents had a science background, and gave us lots of kiddie science books, so I knew pretty well how the world worked. However, I was scared of things that really COULD happen but didn't understand they were unlikely. For example, when mom would take us to see kid's plays at the local performing arts complex, I was convinced that the platform in the ceiling where the huge speakers and stage lights were was going to fall and flatten us. I was also convinced that when we drove through a canyon on the way to go camping that a huge rock would fall from above and crush our car (I was not scared of a flood or landslide, both of which happen in canyons, but just a huge random boulder).
A childhood belief about disasters

others believed things like this
- I was convinced that Indians had dug the Grand Canyon.— Tom Sackett
- I was scared that if I peed too much, the toilet would flood— scarlett
- I used to think that any number with a decimal point in it was HUGE.— sm
- I was certain that rain was created by God having a pee and flushing his huge toilet above us— Emma H
- I used to think the Super Bowl was a huge bowling tournament.Anon
- that Uttoxeter was a huge and important place, cause all roads in Stafforshire point towards it— rosy