First There Were Ten
This is unbelievable, but true. I had an employee whose mother worked in a large can factory in Michigan. She worked on a sheet metal line with many women sitting at a machine stamping out can parts. One woman took off a finger with one of the stamping machines that sliced can tops.
When she recovered and returned to work, the safety officers and OSHA investigators came to her station on the line to talk with her and fill out a full report on how the accident happened. Their purpose was to prevent this from happening again by the possibility of designing some guard to protect the worker.
They asked her to show exactly what she was doing when the accident happened. So, she turned on the machine and fed in the material and whammo, took off another one.