I used to believe that, when it rained in my city, it rained all over the world. It took me a couple years (of young childhood, like, before grade school) and of watching the weather channel on TV as punishment, lol) to figure out that it rained in different areas at different times. Of course, I rarely see someone that was as dumb as I was back in those days.
A childhood belief about weather

others believed things like this
- When I was around four,I used to think when it rained in my area,it rained over the WHOLE world too...Anon
- When I was a kid I thought that when it rained, it rained all over the world.
Anon - I used to believe when I was 4 that when it rained, it rained across the whole world.Anon
- When it rained, it rained all over the planet simultaneously— Artgoober
- I used to believe that when it rained in my town, it rained everywhere.Anon
- I used to believe that when it rained it was raining everywhere in the world— Odette