Last year I cut the back of my hand on a sharp piece of aluminum. I was tightening a bolt and the wrench slipped off the bolt head and my hand went flying into a freshly cut, non-filed aluminum edge. It cut the back of my knuckle; when I clentched my fist to widen the cut, I saw white... first time I've ever seen my own tendon before.
Now our team files everything before we start working on it.