Never fractured a bone. Ever. 500 mL of 2% milk does the trick, and I've had many instances when I should have broken something, but I didn't.
As for my most impressive wound, it would probably be between the two jellyfish who stung me on all the length of the arm and transformed it into a burning pin holder for two days, and when this beast bit me :
For once, fear really did cut deeper than the sword. Her poison isn't actually much more dangerous than a wasp's, other than it's tenfold as painful and lasts for longer. But back when it had bit me, I was thinking their poison was mortal, since I had quickly read an article about them (Myrmecia Pavida) in a biology magazine, and they mentioned they could be fatal to allergic people.
But there, it had just bit me, it hurt like hell, and the only information I had about this ant is that it was deathly dangerous. I never truly feared for my life but for this one time.