I think we all had funny thoughts as childs that we never challenged and just assumed are true.
For example, I used to believe that traffic lights are controlled by people underground.
So when at night the traffic lights went out, they went home.
I also believed that everything costs the same everywhere. For example, if something costs €1 here, I thought it costs $1 in the US. I thought some countries are just considered poor because of the exchange rates. So if I go to a country where €1 gives me 1000 of their local currency, I can just buy 1000x the things there.
What were your funny thoughts as little innocent children exploring and thinking about the world?