We had a plumbing contractor on-site yesterday operating a high pressure drain cleaning machine. He somehow got his hand in the way of something and cut off half of his 3rd finger on his right hand. I work in a hospital. They took him to our ER and reattached it right then and there. It was a clean cut. He was very fortunate but I'm sure he'll lose some movement and have other complications.
You can never be too careful out there guys. Work safe.