Early on in the season a couple years ago my brother skipped school to go snowboarding, and broke his collar bone first run of the day.
As for me, I bruised my knee really bad opening day last year (snowboarding), to the point where I couldn't bend it; I was thankfully able to shred again after laying off it for a week, but it was a burden all season cause I kept re-injuring it every weekend and it never healed.