Funny story about this--buddy of mine in college used to always yell at me for getting drunk and knocking holes in his walls, so one day he comes to my house and decides to get really drunk and punch one of his own. He asks permission first, and I could care less (my housemates and I used to knock the **** outta that wall, so it needed to be repaired anyway).
He backs up, takes a running start, and BAM! He goes silent. Kinda turns around, looks a little pale, and runs out the door. We're all too drunk to think much of it, so no biggie.
Next morning I wake up to a phone call from him asking me to drive him to the local xray technician. He apparently caught a stud with his pinky and ring-finger knuckles, and his hand was so swollen when he woke up that he could hardly move it. Attempts to touch his pinky to his thumb resulted in excruciating pain and the sound of bones grinding.
He wound up needing two surgeries and pins to hold the bones together long enough to heal. He literally shattered his hand.