The Laws of Gravity
There are certain things in this world that have become obvious to us as adults due to the lived experience we have had. What might seem obvious to us isn’t necessarily obvious to children… It takes them a few turns to try different things and experience different things to understand certain rules.
For example, the idea that if you try and drink water lying down, there is a very big chance that it will spill all over you… But this is something children need to discover for themselves. Apparently, this person did, and even though they were too young to voice it, they knew that they wouldn’t ever do that specific thing again.