I never cease to be amazed by the propensity for a young child to frequently, randomly, unexpectedly, come crashing to the ground.
No, sporting events, general playtime, or even goofy sliding around don't count in this assessment. Falling in those situations is all within the realm of the expected. I mean that moment when you see a child walk to a stop, and the little body just keeps on going until the 'thud' and the 'OW!' follow. Or even the random collapse from a seemingly absolute standstill. How do they do that? Does someone need to first KNOW about Newton's laws of motion before they apply?
More.... how do they do that, and keep getting up again? I think once gravity proved itself to be that much an adversary- to rip me over from a halt- I might just stay down.