Wear your helmet.
Illustrated here: Back in August 2011 brothers Riley and Casey Rose were skiing Main Chute at Alta, Utah when one of the bothers releases a rock. The rock comes bouncing down the chute and smashes the lead skier square in the noodle.
A few lessons can be learned from this video:
1. Wear a helmet
2. During the summer months skiing in Utah sucks. Don’t do it.
3. Don’t drop in above your buddy. Ever.
4. Again just don’t go summer skiing in Utah.
5. Wear a helmet camera