This thread has been dormant for quite a while, but I was reminded of another one just the other day. I first heard it years ago while helping the guy I was working for at the time. He'd been in the trade for longer than I'd been alive. I don't remember exactly what it was that he did, but he skinned a knuckle pretty badly.
All he did was look at it and mutter, "Well, the job ain't right unless you draw blood."