I rode with a guy who just got into dirt bikes, probably a year and a half ago. He really wanted to push himself and he would beat the crap out of his bike to do it. I've seen him hit head first into a tree, go flying through the air after hitting a large rock head on. He was riding a YZ426F.
He went to a track for the first time I remember, and he said he was just following everyone else and he went off a triple. He said it was so easy, you have no choice just going up with with some speed, no needing to hit the throttle like the little jumps in the woods (and he would do big air off these jumps in the woods). So he was going around this track, only a few months of riding experience and hitting triples. He said "The only thing was my face hurt because every time you land I would smash my face off the handle bars. Apparently there's a way to land so that doesn't happen but I didn't know how to do that yet".
I was thinking he should slow down a bit, I mean he was also throttling through the woods. Not sure what happened to him.