That reminds me of when I was a kid. My dad had a friend that was a Doctor. He liked to help farm when he had the time. We were picking corn with a one row corn picker and a flat wagon. I was riding in the wagon when the Dr. arrived. My dad started the picker and I saw the Dr. doing something at the side of it. I then saw the Dr. running up to the house yelling something.
The Dr. had been removing stalks and didn't see a moving chain under the stalks and his index finger got sliced off. My dad later found the finger and had it in a sealed glass jar with formaldehyde. I remember taking the finger to show and tell at school once.
I always wondered if the Dr., who worked in the emergency room, was that careless with his patients. He continued to work as a Dr. and used his middle finger as his index finger.