I was hanging outside with some people in our new ward and all of the kids were playing and having a grand ol time. During the hour I was there, Will face planted into the cement, got hit in the head with a soccer ball, tripped dozens of times, fell down the slide, got pushed, etc, etc. And almost every time, he would stand back up and proceed on to whatever he was doing. He didn't make a peep or give it a second thought. And every time, one of the other parents would get all worried and begin to rush over to him until they noticed he was fine. Then they would all comment on how tough he was and that nothing seemed to faze him.
That little goose-egg/bruise on his forehead is from face planting into our kitchen tile. That time he cried, and he cried hard.