I once broke my finger playing chess
That requires great skill.
I broke my thumb, arm, and tailbone skiing, my tailbone again while dirt-jumping (biking,) tore a muscle in my thigh playing soccer, and broke a finger playing football.
EDIT: I forgot to say what I thought about them. In all honesty, I don't really think about them (until they happen

). I do some stuff to reduce them (wear proper safety gear, don't be a complete idiot, etc.) but I know it isn't going to stop them all together, and I accept that.