"Biting it". A big part of growing up. It's amazing how resilient we are when we're little, though. I swear, our bones were made of rubber back then.
(Edit to add: HAH. Same thoughts!)
One of my first memories is falling down the stairs to my parents' basement when I was four or so. The adults were amused that despite tumbling down a full staircase, I did not let go of the toy coffee pot that I had in my hand, and still had it in a firm grip at the bottom. It actually made me laugh when I thought about it, too! That really was a fun coffee pot thing. You'd crank it, and a little ball bounced up and down as if it was perking!