I broke my right ring finger playing football, right below the knuckle. I was 12 (I think), and playing center. Went to cut block the nose guard, missed, put my hand out to brake my fall, and one of his spikes went in, and removed the knuckle part.
1 more. While I was in the military, I got very drunk off of soju (Korean hard core liquor). I got mad, and punched the buttons on an elevator, and cut out a huge chunk of skin from my left pinky knuckle. It was bad, cause I could actually see some of the white from the bone (though there was a ton of blood). I didn't really feel any of the pain til later that night. Anyway it took 14 stitches, BUT, within 3 days it was infected! So the doc re-opened the wound to clean it, then only used 4 stitches in case it got infected again. Left a scar, and don't really have feelings in that knuckle.