My uncle lost his hand, it was hard for him for a while after that, but he has no problems now.
A friend of mine was paralyzed in Iraq, he's come to terms with it and is happy now... well as happy as he can be.
There are many stories like that out there, but you shouldn't just stop to think about life and your priorities when something bad happens. Yes, it puts things into perspective when they do, but you shouldn't wait for something like that to analyze your own life.
