I saw a guy cut the tip of his finger off (at an angle, included some nail and top right quarter of index finger) once cutting up green bell peppers in the kitchen.
The funny thing was, he was complaining that I was cutting too slow and came over to show me how to do it faster. He started chopping away fast, then turned to look at me and said 'See, it's not that hard' when he started jumping up and down yelling. I told him to, well, I'd rather not say.......I thought he was mocking my fear of cutting up these peppers quickly.
He walked off into the prep room and came back out with a blood-soaked rag wrapped around his hand.
Always respect your knives......or they will get you.